@article{SF_1993__46_1_135215,
     author = {J. Almeida},
     title = {A unified syntactical approach  to theorems of {Putcha,} {Margolis,} and {Straubing} on finite power semigroups.},
     journal = {Semigroup forum},
     pages = {90--97},
     year = {1993},
     volume = {46},
     number = {1},
     zbl = {0765.20029},
     url = {http://geodesic.mathdoc.fr/item/SF_1993__46_1_135215/}
}