@article{01883698, title = {On the domain of selfadjoint extension of the product of Sturm-Liouville differential operators.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {2003}, year = {2003}, pages = {695-709}, doi = {10.1155/S0161171203008020}, zbl = {1055.47045}, language = {en}, url = {http://dml.mathdoc.fr/item/01883698} }
Ibrahim, Sobhy El-Sayed. On the domain of selfadjoint extension of the product of Sturm-Liouville differential operators.. International Journal of Mathematics and Mathematical Sciences, Tome 2003 (2003) pp. 695-709. doi : 10.1155/S0161171203008020. http://gdmltest.u-ga.fr/item/01883698/