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Translated from Itogi Nauki i Tekhniki, Seriya Sovremennaya Matematika i Ee Prilozheniya. Tematicheskie Obzory. Vol. 12, Analiz-6, 1994.
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Bobylev, N.A., Korovin, S.K. Topological characteristics of extremals of variational problems. J Math Sci 78, 363–432 (1996). https://doi.org/10.1007/BF02362948
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DOI: https://doi.org/10.1007/BF02362948