TY  - JOUR
AU  - Cramer, Timothy
TI  - Boolean Algebra Retracts
JO  - Canadian journal of mathematics
PY  - 1971
SP  - 339
EP  - 344
VL  - 23
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1971-034-3/
DO  - 10.4153/CJM-1971-034-3
ID  - 10_4153_CJM_1971_034_3
ER  -