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Additional information
Leningrad. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 31, No. 4, pp. 68–76, July–August, 1990.
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Kozlov, S.E. Spherical maps and three-dimensional torsion of surfaces in four-dimensional Riemannian manifolds. I. Sib Math J 31, 584–592 (1990). https://doi.org/10.1007/BF00970628
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DOI: https://doi.org/10.1007/BF00970628