TY  - JOUR
AU  - A. R. D. Mathias
TI  - A solution of a problem of B. Rotman
JO  - Colloquium Mathematicum
PY  - 1977
SP  - 39
EP  - 39
VL  - 38
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm-38-1-39/
DO  - 10.4064/cm-38-1-39
LA  - en
ID  - 10_4064_cm_38_1_39
ER  -