1.

図書
図書
1. Solutions of the examples in a treatise on differential equations
by A.R. Forsyth
出版情報: 東京 : 文精社, 1943.11
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2.

図書
図書
2. Eigenfunction expansions associated with second-order differential equations ([pt. 1] ; pt. 2)
by E.C. Titchmarsh
出版情報: Oxford : Clarendon Press, 1946-1958
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