@book{ BA06574797, author = "Tirion, Wil and Rappaport, Barry and Lovi, George", title = "The Northern Hemisphere to -6゚", publisher = "Willmann-Bell", year = "1987", series = "Uranometria 2000.0 / Wil Tirion, Barry Rappaport, George Lovi", number = "v. 1", URL = "https://ci.nii.ac.jp/ncid/BA06574797" }