@article{04059861, title = {Solvability of a fourth order boundary value problem with periodic boundary conditions.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {11}, year = {1988}, pages = {275-284}, doi = {10.1155/S016117128800033X}, zbl = {0649.34028}, language = {en}, url = {http://dml.mathdoc.fr/item/04059861} }
Gupta, Chaitan P. Solvability of a fourth order boundary value problem with periodic boundary conditions.. International Journal of Mathematics and Mathematical Sciences, Tome 11 (1988) pp. 275-284. doi : 10.1155/S016117128800033X. http://gdmltest.u-ga.fr/item/04059861/