@book{ BA03950098,
 author = "Ashtekar, Abhay",
 title = "New perspectives in canonical gravity",
 publisher = "Bibliopolis",
 year = "1988",
 series = "Monographs and textbooks in physical science : lecture notes",
 number = "5",
 URL = "https://ci.nii.ac.jp/ncid/BA03950098"
}
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