MathSciNet bibliographic data MR787972 (87d:58041) 58E12 (58B15 58C30) Tromba, A. J. Degree theory on oriented infinite-dimensional varieties and the Morse number of minimal surfaces spanning a curve in ${\bf R}\sp n$${\bf R}\sp n$. I. $n\geq 4$$n\geq 4$. Trans. Amer. Math. Soc. 290 (1985), no. 1, 385–413. Article

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