Геодезическая нормаль к поверхности в
Grozó Stanilov (1964)
Commentationes Mathematicae Universitatis Carolinae
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Grozó Stanilov (1964)
Commentationes Mathematicae Universitatis Carolinae
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A. V. Čakmazjan (1968)
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D. V. Rančin (1978)
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