@article{GDZPPN001260146,
title = {Factorization problems in semigroups.},
journal = {Semigroup forum},
volume = {40},
year = {1990},
pages = {23-38},
zbl = {0693.20063},
url = {http://dml.mathdoc.fr/item/GDZPPN001260146}
}
Geroldinger, A.; Lettl, G. Factorization problems in semigroups.. Semigroup forum, Tome 40 (1990) pp. 23-38. http://gdmltest.u-ga.fr/item/GDZPPN001260146/