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@article{DAN_1961_139_4_a1, author = {I. Ts. Gokhberg and M. G. Krein}, title = {Volterra operators with imaginary component in one class or another}, journal = {Doklady Akademii Nauk}, pages = {779--782}, publisher = {mathdoc}, volume = {139}, number = {4}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1961_139_4_a1/} }
I. Ts. Gokhberg; M. G. Krein. Volterra operators with imaginary component in one class or another. Doklady Akademii Nauk, Tome 139 (1961) no. 4, pp. 779-782. http://geodesic.mathdoc.fr/item/DAN_1961_139_4_a1/