@article{GDZPPN001249479,
title = {A generalization of Green's relations in semigroups.},
journal = {Semigroup forum},
volume = {7},
year = {1974},
pages = {74-85},
zbl = {0276.20052},
url = {http://dml.mathdoc.fr/item/GDZPPN001249479}
}
Márki, L.; Steinfeld, O. A generalization of Green's relations in semigroups.. Semigroup forum, Tome 7 (1974) pp. 74-85. http://gdmltest.u-ga.fr/item/GDZPPN001249479/