@article{AUPCDM_2018_10_1_a5,
     author = {Janasz, Marek and Pieronkiewicz, Barbara},
     title = {Factorial number system as an example of substantial learning environment for pre- and in-service teachers of mathematics},
     journal = {Annales Universitatis Paedagogicae Cracoviensis. Studia ad Didacticam Mathematicae Pertinentia},
     pages = {71--91},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPCDM_2018_10_1_a5/}
}