@article{GDZPPN001253425,
title = {On factor S-sets of monoids modulo submonoids.},
journal = {Semigroup forum},
volume = {18},
year = {1979},
pages = {163-172},
zbl = {0419.20049},
url = {http://dml.mathdoc.fr/item/GDZPPN001253425}
}
Grassmann, H. On factor S-sets of monoids modulo submonoids.. Semigroup forum, Tome 18 (1979) pp. 163-172. http://gdmltest.u-ga.fr/item/GDZPPN001253425/