Chronowski, A., Klakla, M., Powązka, Z. and Żabowski, J. 2020. Professor Bogdan Jan Nowecki in memory. Annales Universitatis Paedagogicae Cracoviensis | Studia ad Didacticam Mathematicae Pertinentia. 12, (Dec. 2020), 261–264. DOI:https://doi.org/10.24917/20809751.12.13.