TY - GEN L1 - http://www.dbc.wroc.pl/Content/40915/PDF/PPoMP_2018_54_2_527_537.pdf L2 - http://www.dbc.wroc.pl/Content/40915 CY - Wroclaw UR - http://www.dbc.wroc.pl/dlibra/publication/edition/40915 ER -