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51WagWagner, V. Theory of field of local n-2-dimensional surfaces in X-n and its application to the problem of Lagrange in the calculus of variations [Текст] / V. Wagner. — s.l., 1948. — p.141-188.
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Окремий відбиток з: Annals of mathematics, V.49, No. 1, 1948
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