@article{05574345, title = {A new extension theorem for concave operators.}, journal = {Fixed Point Theory and Applications [electronic only]}, volume = {2009}, year = {2009}, doi = {10.1155/2009/571546}, zbl = {1172.46001}, language = {en}, url = {http://dml.mathdoc.fr/item/05574345} }
Peng, Jian-Wen; Rong, Wei-Dong; Yao, Jen-Chih. A new extension theorem for concave operators.. Fixed Point Theory and Applications [electronic only], Tome 2009 (2009) . doi : 10.1155/2009/571546. http://gdmltest.u-ga.fr/item/05574345/