@book{ BA06756262,
 author = "Symposium in Pure Mathematics and Spencer, Donald Clayton and American Mathematical Society",
 title = "Partial differential equations",
 publisher = "American Mathematical Society",
 year = "1973",
 series = "Proceedings of symposia in pure mathematics",
 number = "v. 23",
 URL = "https://ci.nii.ac.jp/ncid/BA06756262"
}
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