@article{GDZPPN001255479,
title = {P-systems in regular semigroups.},
journal = {Semigroup forum},
volume = {24},
year = {1982},
pages = {173-188},
zbl = {0479.20030},
url = {http://dml.mathdoc.fr/item/GDZPPN001255479}
}
Yamada, M. P-systems in regular semigroups.. Semigroup forum, Tome 24 (1982) pp. 173-188. http://gdmltest.u-ga.fr/item/GDZPPN001255479/