@article{SF_1979__18_134366,
     author = {R.F. Tichy},
     title = {Polynomial functions over monoids.},
     journal = {Semigroup forum},
     pages = {371--380},
     publisher = {mathdoc},
     volume = {18},
     year = {1979},
     zbl = {0425.20051},
     url = {http://geodesic.mathdoc.fr/item/SF_1979__18_134366/}
}