@article{03708917, title = {Existence theorem for the difference equation }, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {3}, year = {1980}, pages = {69-77}, doi = {10.1155/S0161171280000051}, zbl = {0453.39001}, language = {en}, url = {http://dml.mathdoc.fr/item/03708917} }
Weil, F. Existence theorem for the difference equation . International Journal of Mathematics and Mathematical Sciences, Tome 3 (1980) pp. 69-77. doi : 10.1155/S0161171280000051. http://gdmltest.u-ga.fr/item/03708917/