@article{02174296, title = {Dynamics of finite-multivalued transformations.}, journal = {Lobachevskii Journal of Mathematics}, volume = {17}, year = {2005}, pages = {47-60}, zbl = {1089.37001}, language = {en}, url = {http://dml.mathdoc.fr/item/02174296} }
Igudesman, Konstantin B. Dynamics of finite-multivalued transformations.. Lobachevskii Journal of Mathematics, Tome 17 (2005) pp. 47-60. http://gdmltest.u-ga.fr/item/02174296/