@article{SF_1980__21_134457,
     author = {V.l. Trofimov},
     title = {The growth functions of finitely generated semigroups.},
     journal = {Semigroup forum},
     pages = {351--360},
     publisher = {mathdoc},
     volume = {21},
     year = {1980},
     zbl = {0453.20047},
     url = {http://geodesic.mathdoc.fr/item/SF_1980__21_134457/}
}