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@article{MZM_2002_72_2_a16, author = {A. S. Kostenko}, title = {On the {Defect} {Index} of {Quadratic} {Self-Adjoint} {Operator} {Pencils}}, journal = {Matemati\v{c}eskie zametki}, pages = {315--320}, publisher = {mathdoc}, volume = {72}, number = {2}, year = {2002}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_2002_72_2_a16/} }
A. S. Kostenko. On the Defect Index of Quadratic Self-Adjoint Operator Pencils. Matematičeskie zametki, Tome 72 (2002) no. 2, pp. 315-320. http://geodesic.mathdoc.fr/item/MZM_2002_72_2_a16/