@article{GDZPPN001254588,
title = {Left chain semigroups.},
journal = {Semigroup forum},
volume = {23},
year = {1981},
pages = {1-8},
zbl = {0459.20061},
url = {http://dml.mathdoc.fr/item/GDZPPN001254588}
}
Kozhukhov, I.B. Left chain semigroups.. Semigroup forum, Tome 23 (1981) pp. 1-8. http://gdmltest.u-ga.fr/item/GDZPPN001254588/