TY  - JOUR
AU  - Žembery, Ivan
TI  - Uniqueness of improper operations
JO  - Czechoslovak Mathematical Journal
PY  - 1992
SP  - 19
EP  - 23
VL  - 42
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1992.128320/
DO  - 10.21136/CMJ.1992.128320
LA  - en
ID  - 10_21136_CMJ_1992_128320
ER  -