@article{00823350, title = {Existence theorems for a second order }, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {18}, year = {1995}, pages = {705-710}, doi = {10.1155/S0161171295000901}, zbl = {0839.34027}, language = {en}, url = {http://dml.mathdoc.fr/item/00823350} }
Gupta, Chaitan P. Existence theorems for a second order . International Journal of Mathematics and Mathematical Sciences, Tome 18 (1995) pp. 705-710. doi : 10.1155/S0161171295000901. http://gdmltest.u-ga.fr/item/00823350/