@article{SF_1989__38_2_134968,
     author = {Gerard Lallement},
     title = {Languages recognized by programs over the two-element monoid.},
     journal = {Semigroup forum},
     pages = {371--374},
     publisher = {mathdoc},
     volume = {38},
     number = {2},
     year = {1989},
     zbl = {0668.20045},
     url = {http://geodesic.mathdoc.fr/item/SF_1989__38_2_134968/}
}