TY  - JOUR
AU  - Nelson, Evelyn
TI  - The Lattice of Equational Classes of Semigroups with Zero
JO  - Canadian mathematical bulletin
PY  - 1971
SP  - 531
EP  - 534
VL  - 14
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1971-094-3/
DO  - 10.4153/CMB-1971-094-3
ID  - 10_4153_CMB_1971_094_3
ER  -