TY  - JOUR
AU  - Kosiński, Łukasz
AU  - Zwonek, Włodzimierz
TI  - Extension Property and Universal Sets
JO  - Canadian journal of mathematics
PY  - 2021
SP  - 717
EP  - 736
VL  - 73
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4153/S0008414X20000139/
DO  - 10.4153/S0008414X20000139
ID  - 10_4153_S0008414X20000139
ER  -