@article{DM_2008_20_4_a5,
     author = {V. K. Kartashov},
     title = {Independent systems of generators and the {Hopf} property for unary algebras},
     journal = {Diskretnaya Matematika},
     pages = {79--84},
     publisher = {mathdoc},
     volume = {20},
     number = {4},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2008_20_4_a5/}
}