Notation
Throughout this paper Greek indicesα, β, ⋯, and Latin indicesi, j, h, k, assume the values 1, ⋯,m, and 1, ⋯,n respectively. The summation convention is operative in respect of both sets of indices.
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This work was supported by the South African Council for Scientific and Industrial Research.
At time of writing Professor Grässer was Visiting Scholar at the University of Arizona, Tucson, Arizona.
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Grässer, H.S.P. The complete figure for second order multiple integral problems in the calculus of variations. Aeq. Math. 14, 363–386 (1976). https://doi.org/10.1007/BF01835985
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DOI: https://doi.org/10.1007/BF01835985