@article{1077374667, author = {Gilbert, Richard C. and Kramer, Vernon A.}, title = {Trace formulas for a perturbed operator}, journal = {Duke Math. J.}, volume = {30}, number = {1}, year = {1963}, pages = { 275-296}, language = {en}, url = {http://dml.mathdoc.fr/item/1077374667} }
Gilbert, Richard C.; Kramer, Vernon A. Trace formulas for a perturbed operator. Duke Math. J., Tome 30 (1963) no. 1, pp. 275-296. http://gdmltest.u-ga.fr/item/1077374667/