Geodesic
On perturbation of a multiple eigenvalue
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 60 (2005) no. 1, pp. 169-170 
S. A. Stepin; V. N. Titov. On perturbation of a multiple eigenvalue. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 60 (2005) no. 1, pp. 169-170. http://geodesic.mathdoc.fr/item/RM_2005_60_1_a11/
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