@article{03728940, title = {A generalization of contraction principle.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {4}, year = {1981}, pages = {201-206}, doi = {10.1155/S0161171281000148}, zbl = {0465.47037}, language = {en}, url = {http://dml.mathdoc.fr/item/03728940} }
Ghosh, K.M. A generalization of contraction principle.. International Journal of Mathematics and Mathematical Sciences, Tome 4 (1981) pp. 201-206. doi : 10.1155/S0161171281000148. http://gdmltest.u-ga.fr/item/03728940/