TY  - JOUR
AU  - Broughan, K. A.
TI  - On the Number of Structures of Reflexive and Transitive Relations
JO  - Canadian journal of mathematics
PY  - 1973
SP  - 1269
EP  - 1273
VL  - 25
IS  - 6
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1973-133-9/
DO  - 10.4153/CJM-1973-133-9
ID  - 10_4153_CJM_1973_133_9
ER  -