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This work was partially carried out under the auspices of the Sonderforschungsbereich 40 at the University of Bonn. The first-named author also wants to thank Stanford University for its hospitality during the academic year 1975–76.
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Hildebrandt, S., Kaul, H. & Widman, KO. An existence theorem for harmonic mappings of Riemannian manifolds. Acta Math 138, 1–16 (1977). https://doi.org/10.1007/BF02392311
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DOI: https://doi.org/10.1007/BF02392311