TY  - JOUR
AU  - Zelinka, Bohdan
TI  - Tolerance relations on periodic commutative semigroups
JO  - Czechoslovak Mathematical Journal
PY  - 1977
SP  - 167
EP  - 169
VL  - 27
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1977.101454/
DO  - 10.21136/CMJ.1977.101454
LA  - en
ID  - 10_21136_CMJ_1977_101454
ER  -