@article{05028448, title = {Duan's fixed point theorem: proof and generalization.}, journal = {Fixed Point Theory and Applications [electronic only]}, volume = {2006}, year = {2006}, doi = {10.1155/FPTA/2006/17563}, zbl = {1093.55002}, language = {en}, url = {http://dml.mathdoc.fr/item/05028448} }
Arkowitz, Martin. Duan's fixed point theorem: proof and generalization.. Fixed Point Theory and Applications [electronic only], Tome 2006 (2006) . doi : 10.1155/FPTA/2006/17563. http://gdmltest.u-ga.fr/item/05028448/