TY  - JOUR
AU  - Antoni Smoluk
TI  - Invariant approximations
JO  - Mathematica Applicanda
PY  - 1981
SP  -  17
EP  - 22
VL  - 9
IS  - 17
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.14708/ma.v9i17.1512/
DO  - 10.14708/ma.v9i17.1512
LA  - pl
ID  - 10_14708_ma_v9i17_1512
ER  -