@article{GDZPPN001262130,
title = {Limited semaphore codes.},
journal = {Semigroup forum},
volume = {44},
year = {1992},
pages = {364-371},
zbl = {0772.94003},
url = {http://dml.mathdoc.fr/item/GDZPPN001262130}
}
Satyanarayana, M.; Mohanty, S. Limited semaphore codes.. Semigroup forum, Tome 44 (1992) pp. 364-371. http://gdmltest.u-ga.fr/item/GDZPPN001262130/