TY  - JOUR
TI  - Zprávy
JO  - Mathematica Bohemica
PY  - 1992
VL  - 117
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/MB.1992.126062/
DO  - 10.21136/MB.1992.126062
LA  - cz
ID  - 10_21136_MB_1992_126062
ER  -