@article{bwmeta1.element.bwnjournal-article-cmv8i1p223bwm,
author = {A. Wallace},
title = {Problems on semigroups},
journal = {Colloquium Mathematicae},
volume = {8},
year = {1961},
pages = {223-224},
zbl = {0095.01404},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-cmv8i1p223bwm}
}
Wallace, A. Problems on semigroups. Colloquium Mathematicae, Tome 8 (1961) pp. 223-224. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-cmv8i1p223bwm/