@article{02168636, title = {Geometric aspects of higher-order eigenvalue problems. I: Structures on spaces of boundary conditions.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {2004}, year = {2004}, pages = {647-678}, doi = {10.1155/S0161171204303522}, zbl = {1078.34065}, language = {en}, url = {http://dml.mathdoc.fr/item/02168636} }
Cao, Xifang; Wu, Hongyou. Geometric aspects of higher-order eigenvalue problems. I: Structures on spaces of boundary conditions.. International Journal of Mathematics and Mathematical Sciences, Tome 2004 (2004) pp. 647-678. doi : 10.1155/S0161171204303522. http://gdmltest.u-ga.fr/item/02168636/