Books by Willard L. Miranker:
Books in the extended shelves:
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Miranker, Willard L.: The asymptotic theory of solutions of [delta] u+k²u = 0 (New York, New York : New York University, Institute of Mathematical Sciences, Division of Electromagnetic Research, 1957., 1957), also by United States. Air Force. Office of Scientific Research and New York University. Institute of Mathematical Sciences (page images at HathiTrust)
Find more by Willard L. Miranker at your library, or elsewhere.