TY  - JOUR
AU  - Anderson, D. D.
AU  - Matijevic, J.
TI  - Graded π-rings
JO  - Canadian journal of mathematics
PY  - 1979
SP  - 449
EP  - 457
VL  - 31
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1979-050-0/
DO  - 10.4153/CJM-1979-050-0
ID  - 10_4153_CJM_1979_050_0
ER  -