@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/