@article{03962557, title = {On a fixed point theorem of Gregu\v s.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {9}, year = {1986}, pages = {23-28}, doi = {10.1155/S0161171286000030}, zbl = {0597.47036}, language = {en}, url = {http://dml.mathdoc.fr/item/03962557} }
Fisher, Brian; Sessa, Salvatore. On a fixed point theorem of Greguš.. International Journal of Mathematics and Mathematical Sciences, Tome 9 (1986) pp. 23-28. doi : 10.1155/S0161171286000030. http://gdmltest.u-ga.fr/item/03962557/