TY - GEN L1 - http://www.dbc.wroc.pl/Content/40910/PDF/PPoMP_2018_54_2_476_483.pdf L2 - http://www.dbc.wroc.pl/Content/40910 CY - Wroclaw UR - http://www.dbc.wroc.pl/dlibra/publication/edition/40910 ER -