@article{1256050924, author = {Glick, Noel}, title = {Perturbation of a self adjoint differential operator}, journal = {Illinois J. Math.}, volume = {19}, number = {4}, year = {1975}, pages = { 71-76}, language = {en}, url = {http://dml.mathdoc.fr/item/1256050924} }
Glick, Noel. Perturbation of a self adjoint differential operator. Illinois J. Math., Tome 19 (1975) no. 4, pp. 71-76. http://gdmltest.u-ga.fr/item/1256050924/