@book{ BA33428324,
 author = "Mironov, Boris Nikolaevich and Kovalʹchenko, Ivan Dmitrievich",
 title = "История в цифрах : математика в исторических исследованиях",
 publisher = ""Наука," Ленинградское отделение",
 year = "1991",
 series = "Серия "История и современность"",
 number = "",
 URL = "https://ci.nii.ac.jp/ncid/BA33428324"
}
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