@article{GDZPPN00125314X,
title = {Quasi resolved semigroups and quintets.},
journal = {Semigroup forum},
volume = {18},
year = {1979},
pages = {267-278},
zbl = {0407.20057},
url = {http://dml.mathdoc.fr/item/GDZPPN00125314X}
}
Krishnan, V.S. Quasi resolved semigroups and quintets.. Semigroup forum, Tome 18 (1979) pp. 267-278. http://gdmltest.u-ga.fr/item/GDZPPN00125314X/