@article{00007765, title = {Solvability of a fourth-order boundary value problem with periodic boundary conditions. II.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {14}, year = {1991}, pages = {127-137}, doi = {10.1155/S0161171291000121}, zbl = {0742.34022}, language = {en}, url = {http://dml.mathdoc.fr/item/00007765} }
Gupta, Chaitan P. Solvability of a fourth-order boundary value problem with periodic boundary conditions. II.. International Journal of Mathematics and Mathematical Sciences, Tome 14 (1991) pp. 127-137. doi : 10.1155/S0161171291000121. http://gdmltest.u-ga.fr/item/00007765/