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@article{RCM_1973__7_181602, author = {D. K. Rao}, title = {Symmetric perturbation of a self-adjoint operator}, journal = {Revista colombiana de matematicas}, pages = {81--84}, publisher = {mathdoc}, volume = {7}, year = {1973}, zbl = {0295.47020}, url = {http://geodesic.mathdoc.fr/item/RCM_1973__7_181602/} }
D. K. Rao. Symmetric perturbation of a self-adjoint operator. Revista colombiana de matematicas, Tome 7 (1973), pp. 81-84. http://geodesic.mathdoc.fr/item/RCM_1973__7_181602/