@article{GDZPPN001256831,
title = {A note on intersections of free submonoids of a free monoid.},
journal = {Semigroup forum},
volume = {30},
year = {1984},
pages = {183-206},
zbl = {0555.20037},
url = {http://dml.mathdoc.fr/item/GDZPPN001256831}
}
Karhumäki, J. A note on intersections of free submonoids of a free monoid.. Semigroup forum, Tome 30 (1984) pp. 183-206. http://gdmltest.u-ga.fr/item/GDZPPN001256831/