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References
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| 1. |
N. V. Efimov, “Vozniknovenie osobennostei na poverkhnostyakh otritsatelnoi krivizny”, Matem. sb., 64 (1964), 286–320    |
| 2. |
D. D. Sokolov, “O dvumernykh vypuklykh poverkhnostyakh s definitnoi metrikoi v trekhmernom
psevdoevklidovom prostranstve”, Trudy geometr. seminara, 6, In-t nauchn.-tekhn. inform. AN, 1974, 271–288 |
| 3. |
R. Sacksteder, “On hypersurfaces with nonnegative sectional curvatures”, Amer. J. Math., 82 (1960), 609–630  |
| 4. |
D. D. Sokolov, “O stroenii predelnogo konusa vypukloi poverkhnosti v psevdoevklidovom
prostranstve”, UMN, 30:1 (1975), 261–262 |
| 5. |
D. D. Sokolov, “O nekotorykh svoistvakh indefinitnoi metriki”, Matem sb., 86 (1971), 3–8 |
