@article{GDZPPN001260162,
title = {Dualities in lattices of semigroup varieties.},
journal = {Semigroup forum},
volume = {40},
year = {1990},
pages = {59-76},
zbl = {0687.20055},
url = {http://dml.mathdoc.fr/item/GDZPPN001260162}
}
Vernikov, B. M. Dualities in lattices of semigroup varieties.. Semigroup forum, Tome 40 (1990) pp. 59-76. http://gdmltest.u-ga.fr/item/GDZPPN001260162/