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Dedicated to ProfessorE. Sperner on the occasion of his 60th birthday
At the time of writing with the Department of Mathematics, University of Toronto, Toronto, Canada.
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Rund, H. Variational problems involving combined tensor fieds. Abh.Math.Semin.Univ.Hambg. 29, 243–262 (1966). https://doi.org/10.1007/BF03016051
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DOI: https://doi.org/10.1007/BF03016051