@book{ BA29639494,
 author = "Bernstein, Dorothy Lewis",
 title = "Existence theorems in partial differential equations",
 publisher = "Kraus",
 year = "1965",
 series = "Annals of mathematics studies",
 number = "no. 23",
 URL = "https://ci.nii.ac.jp/ncid/BA29639494"
}
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