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@article{CMJ_1999__49_1_a17, author = {Ercan, Zafer}, title = {A generalisation of a theorem of {Koldunov} with an elementary proof}, journal = {Czechoslovak Mathematical Journal}, pages = {187--190}, publisher = {mathdoc}, volume = {49}, number = {1}, year = {1999}, mrnumber = {1676793}, zbl = {0954.46003}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CMJ_1999__49_1_a17/} }
Ercan, Zafer. A generalisation of a theorem of Koldunov with an elementary proof. Czechoslovak Mathematical Journal, Tome 49 (1999) no. 1, pp. 187-190. http://geodesic.mathdoc.fr/item/CMJ_1999__49_1_a17/