@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/