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The general solution for a class of equations of even order is expressed as a sum of solutions of equations of second order.
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To Mauro Picone on his 70th birthday.
This research was supported in part by the United States Air Force under Contract No. AF(600)-573 — monitored by the Office of Scientific Research, Air Research and Development Command.
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Weinstein, A. On a class of partial differential equations of even order. Annali di Matematica 39, 245–254 (1955). https://doi.org/10.1007/BF02410772
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DOI: https://doi.org/10.1007/BF02410772