@article{05382093, title = {On the Ulam problem for Euler quadratic mappings.}, journal = {Novi Sad Journal of Mathematics}, volume = {35}, year = {2005}, pages = {57-66}, zbl = {1164.39334}, language = {en}, url = {http://dml.mathdoc.fr/item/05382093} }
Rassias, John Michael. On the Ulam problem for Euler quadratic mappings.. Novi Sad Journal of Mathematics, Tome 35 (2005) pp. 57-66. http://gdmltest.u-ga.fr/item/05382093/