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The work was sponsored by the U. S. Army Research Office (Durham), Grant DA-ARO(D) 31-124-G499, University of California, Los Angeles, the Air Force Office of Scientific Research Contract # AF 49(638)1345, and the National Science Foundation.
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Sario, L., Schiffer, M. & Glasner, M. The span and principal functions in Riemannian spaces. J. Anal. Math. 15, 115–134 (1965). https://doi.org/10.1007/BF02787691
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DOI: https://doi.org/10.1007/BF02787691