TY  - JOUR
AU  - E. Grzegorek
TI  - A solution of a problem of B. Rotman
JO  - Colloquium Mathematicum
PY  - 1977
SP  - 37
EP  - 38
VL  - 38
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm-38-1-37-38/
DO  - 10.4064/cm-38-1-37-38
LA  - en
ID  - 10_4064_cm_38_1_37_38
ER  -