• 12. Rostocker Bioenergieforum , 28-29.06.2018 , Rostock, Germany
• 12th ACM International Conference on Computing Frontiers , 18-21.05.2015 , Ischia, Italy
• 12th AES Symposium New Trends in Audio and Video. 12th Signal Processing Workshop / Algorithms, Architectures, Arrangements and Applications , 25-27.09.2008 , Poznań, Polska
• 12th annual International Conference of Education, Research and Innovation , 11-13.11.2019 , Sevilla, Spain
• 12th Asian Conference on Computer Vision , 1-5.11.2015 , Singapore, Singapore
• 12th Asia-Pacific Conference on Communications , 31.08.2006 - 02.09.2006 , Busan, South Korea
• 12th Asia-Pacific Network Operations and Management Symposium , 23-25.09.2009 , Jeju, South Korea
• 12th ASME Biennial Conference on Engineering Systems Design and Analysis ESDA2014 , 25-27.06.2014 , Copenhagen, Denmark
• 12th CIRP Seminar on Life Cycle Engineering , 3-5.04.2005 , Grenoble, France
• 12th Conference on Dynamical Systems - Theory and Applications , 2-5.12.2013 , Łódż, Poland
• 12th Conference on Service-Oriented Computing and Applications SOCA 2019 , 18-21.11.2019 , Kaohsiung, Taiwan, Province of China
• 12th EAEC European Automotive Congress: Europe in the Second Century of Auto-Mobility , 29.06.2009 - 01.07.2009 , Bratislava, Slovakia
• 12th EAI International Conference on Cognitive Radio Oriented Wireless Networks (CROWNCOM 2017) , 20-21.09.2017 , Lisbon, Portugal
• 12th East European Conference on Advances in Databases and Information Systems, ADBIS 2008 , 5-9.09.2008 , Pori, Finland
• 12th edition of the Metaheuristics International Conference (MIC 2017) and the XII Metaheurísticas, Algoritmos Evolutivos y Bioinspirados (MAEB 2017) , 4-7.07.2017 , Barcelona, Spain
• 12th European Conference on Power Electronics and Applications, EPE'07 , 2-5.09.2007 , Aalborg, Denmark
• 12th European Fluid Mechanics Conference : EFMC12 , 9-13.09.2018 , Vienna, Austria
• 12th European Signal Processing Conference EUSIPCO 2004 , 6-10.09.2004 , Vienna, Austria
• 12th GAMM - IMACS International Symposium on Scientific Computing, Computer Arithmetic and Validated Numerics , 26-29.09.2006 , Duisburg, Germany
• 12th German-Lithuanian-Polish Colloquium on Sustainable Development in Civil Engineering and Multi-Attribute Decision Making , 23-25.05.2009 , Vilnius, Lithuania
• 12th GI/ITG Conference on Measuring, Modelling and Evaluation of Computer and Communication Systems (MMB) together with the 3rd Polish-German Teletraffic Symposium (PGTS) , 12-15.09.2004 , Dresden, Germany
• 12th IEEE International Conference on Image Processing, ICIP 2005 , 14.09.2005 , Genova, Italy
• 12th IEEE International Conference on Methods and Models in Automation and Robotics , 28-31.08.2006 , Międzyzdroje, Poland
• 12th IEEE International Symposium on Broadband Multimedia Systems and Broadcastings ( BMSB 2017 ) , 7-9.06.2017 , Cagliari, Włochy
• 12th IMEKO TC1 & TC7 joint symposium on "man, science & measurement" , 3-5.09.2008 , Annecy, France
• 12th International Conference, ADHOC-NOW 2013 , 8-10.07.2013 , Wrocław, Poland
• 12th International Conference and Exhibition on Electrical Power Quality and Utilisation : EPQU , 11-14.09.2020
• 12th International Conference BIOMDLORE 2018 , 28-30.06.2018 , Białystok, Polska
• 12th International Conference, LVA/ICA 2015 , 25-28.08.2015 , Liberec, Czech Republic
• 12th International Conference, MDAI 2015 , 21-23.09.2015 , Skövde, Sweden
• 12th International Conference Mixed Design of Integrated Circuits and Systems, MIXDES 2005 , 22-25.07.2005 , Kraków, Poland
• 12th International Conference on Advanced Manufacturing Technologies (AMT2018) , 1-3.07.2018 , Sozopol, Bulgaria
• 12th International Conference on Artificial Intelligence and Soft Computing, ICAISE 2013 , 9-13.06.2013 , Zakopane, Poland
• 12th International Conference on Business Process Management (BPM) , 7-11.09.2014 , Eindhoven, Netherlands
• 12th International Conference on Chemical & Process Engineering , 19-22.05.2015 , Milano, Italy / ICHEAP
• 12th International Conference on Climbing and Walking Robots and the Support Technologies for Mobile Machines , 9-11.09.2009 , Istanbul, Turkey
• 12th International Conference on Difference Equations and Applications, ICDEA 2007 , 23-27.07.2007 , Lisbon, Portugal
• 12th International Conference on Dynamical Systems-Theory and Applications, DSTA 2013 , 2-5.12.2013 , Lodz, Poland
• 12th International Conference on High Performance Switching and Routing (HPSR) , 4-6.07.2011 , Cartagena, Hiszpania
• 12th International Conference on Informatics in Control, Automation and Robotics , 21-23.07.2015 , Colmar, France
• 12th International Conference on Language Resources and Evaluation (LREC-2020) , 11-16.05.2020 , Marseille, France
• 12th International Conference on Management of Digital EcoSystems (MEDES'20) , 2-4.11.2020 , Abu Dhabi, United Arab Emirates
• 12th International Conference on Measurement 2019 , 27-29.05.2019 , Smolenice, Slovac Republic
• 12th International Conference on Metal Structures , 15-17.06.2011 , Wrocław, Polska
• 12th International Conference on Metrology and Properties of Engineering Surfaces , 8-10.07.2009 , Rzeszów, Poland
• 12th International Conference on Parallel Processing and Applied Mathematics, PPAM 2017 , 11-13.09.2017 , Lublin, Poland
• 12th International Conference on Pressure Vessel Technology , 20-23.09.2009 , Jeju, South Korea
• 12th International Conference on Problems of Materials Engineering, Mechanics and Design , 29-31.08.2007 , Jasná, Slovak Republic
• 12th International Conference on Sandwich Structures ICSS-12 , 19-22.08.2018 , Lausanne, Switzerland
• 12th International Conference on Software Quality SWQD 2020 , 14-17.01.2020 , Vienna, Austria
• 12 th International Conference on Structural Analysis of Historical Constructions SAHC 2021 , 29.09.2021 - 01.10.2021
• 12th International Conference on Telecommunications, ICT'05 , 3-6.05.2005 , Capetown, South Africa
• 12th International Conference on the European Energy Market (EEM) , 19-22.05.2015 , Lisbon, Portugal
• 12th International Conference Quality Production Improvement QPI 2018 , 18-20.06.2018 , Zaborze k. Częstochowy, Polska
• 12th International Days of Statistics and Economics , 6-8.09.2018 , Prague, Czech Republic
• 12th International ETH Conference on Combustion Generated Nanoparticles , 23-25.06.2008 , Zurich, Switzerland
• 12th International European Conference on Parallel and Distributed Computing, Euro-Par 2006 , 28.08.2006 - 01.09.2006 , Dresden, Germany
• 12th International Power Electronics and Motion Control Conference , 30.08.2006 - 01.09.2006 , Portoroz, Slovenia
• 12th International QMOD and Toulon-Verona Conference on Quality and Services Sciences, ICQSS 2009 , 27-29.08.2009 , Verona, Italy
• 12th International Road Safety Conference GAMBIT 2018 , 12-13.04.2018 , Gdańsk, Poland
• 12th International School on Theoretical Physics - Symmetry and Structural Properties of Condensed Matter (SSPCM) , 5-10.09.2016 , Rzeszów, Poland
• 12th International Scientific and Technical Conference on Marine Traffic Engineering , 21-23.11.2007 , Świnoujście - Szczecin, Polska
• 12th International Scientific and Technical Conference on Transport, Road-Building, Agricultural, Hoisting & Hauling and Military Technics and Technologies, trans & MOTAUTO'05 , 23-25.11.2005 , Veliko Tarnovo, Bulgaria
• 12th International Scientific Conference Automation in Production Planning and Manufacturing , 3-5.05.2011 , Zilina, Slovac Republic
• 12th International Scientific Conference of Young Scientists on Sustainable, Modern and Safe Transport TRANSCOM 2017 , 31.05.2017 - 02.06.2017 , High Tatras, Słowacja / TRANSCOM
• 12th International Symposium on Advances in Extraction Technologies ExTech 2010 , 20-22.09.2010 , Poznań, Polska
• 12th International Symposium on Distributed Computing and Artificial Intelligence 2015 (DCAI 2015) , 3-5.06.2015 , Salamanca, Spain
• 12th International Symposium on Interdisciplinary Electromagnetic, Mechanic and Biomedical Problems 2005 , 12-14.09.2005 , Bad Gastein, Austria
• 12th International Symposium on Occupational Safety and Hygiene of Portuguese Society of Occupational Safety and Hygiene(SHO) , 23-24.03.2016 , Guimarães, Portugal
• 12th International Symposium on Sound and Vision Engineering and Mastering (ISSVEM'07) , 15.06.2007
• 12th International Technical Conference Technological Forum 2021 , 30.06.2021 - 02.07.2021
• 12th International Wireless Communications & Mobile Computing Conference (IWCMC) , 5-9.09.2016 , Paphos, Cyprus
• 12th International Workshop on Robot Motion and Control RoMoCo 2019 , 8-10.07.2019 , Poznań, Poland
• 12th International Workshop on Systems, Signals and Image Processing IWSSIP 2005 , 22-24.09.2005 , Chalkida, Greece
• 12th IWA Specialised Conference on Design, Operation and Economics of Large Wastewater Treatment Plants , 6-9.09.2015 , Prague, Czech Republic
• 12th Mediterranean Conference on Control and Automation MED 2004 , 6-9.06.2004 , Kusadasi, Turkey
• 12th NETTIES (Networking Entities) International Conference , 6-9.09.2006 , Timisoara, Romania
• 12th Polish Teletraffic Symposium : PSRT'2005 , 19-20.09.2005 , Poznań, Polska
• 12th QMOD and Toulon-Verona Conference , 27-29.08.2009 , Verona, Italy
• 12th Student International Scientific and Practical Conference , 10.12.2020 , Lwów, Ukraina
• 12th Workshop on High Voltage Engineering , 20-24.09.2004 , Lübbenau/Spreewald, Germany
• 130 MPEG Meeting , 20-24.04.2020 , Alpbaach, Austria
• 131 MPEG Meeting , 6-10.06.2020 , Geneva, Switzerland
• 132 MPEG Meeting , 12-16.10.2020 , Rennes, Francja
• 133 MPEG Meeting , 11-15.01.2021
• 134 MPEG Meeting , 04.2021
• 135 MPEG Meeting , 12-16.07.2021
• 136 MPEG Meeting , 11-15.10.2021
• 137 MPEG Meeting , 17-21.01.2022 , Poznań, Poland
• 138 MPEG Meeting , 25-29.04.2022
• 139 MPEG Meeting , 18-22.07.2022
• 13. Środkowo-Europejska Konferencja Recykling i Odzysk , 7-9.09.2017 , Białystok, Polska, Grodno, Białoruś
• 13th AHFE International Conference on Production Management and Process Control , 24-28.07.2022 , New York, USA
• 13th APCA International Conference on Automatic Control and Soft Computing , 4-6.06.2018 , Ponta Delgada, São Miguel Island, Azores, Portugal
• 13th Conference on Calorimetry and Thermal Analysis , 2-6.09.2018 , Zakopane, Polska
• 13th Conference on Dynamical Systems - Theory and Applications, DSTA 2015 , 7-10.12.2015 , Lodz, Poland / DSTA
• 13th EAI International Conference, CROWNCOM 2018 , 18-20.09.2018 , Ghent, Belgium
• 13th European Conference on Antennas and Propagation, EuCAP 2019 , 31.03.2019 - 05.04.2019 , Kraków, Poland
• 13th European Control Conference (ECC) , 24-27.06.2014 , Strasbourg, France
• 13th European Semantic Web Conference (ESWC) , 29.05.2016 - 02.06.2016 , Heraklion, Greece