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The work, of which this paper is part, is now being sponsored by theNational Science Foundation, U. S. A.
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Goffman, C. Lower-semi-continuity and area functionals. Rend. Circ. Mat. Palermo 2, 203–235 (1953). https://doi.org/10.1007/BF02843763
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DOI: https://doi.org/10.1007/BF02843763