TY  - JOUR
AU  - Zdzisław Porosiński
AU  - Marek Skarupski
AU  - Krzysztof Szajowski
TI  - Duration problem: basic concept and some extensions
JO  - Mathematica Applicanda
PY  - 2016
SP  -  87
EP  - 112
VL  - 44
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.14708/ma.v44i1.829/
DO  - 10.14708/ma.v44i1.829
LA  - pl
ID  - 10_14708_ma_v44i1_829
ER  -