TY  - JOUR
AU  - Niederle, Josef
TI  - Conditions for transitive principal tolerances
JO  - Czechoslovak Mathematical Journal
PY  - 1989
SP  - 380
EP  - 381
VL  - 39
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1989.102309/
DO  - 10.21136/CMJ.1989.102309
LA  - en
ID  - 10_21136_CMJ_1989_102309
ER  -