@book{
  author = "Einstein, Albert, 1879-1955, 小玉, 英雄 (1952-)",
  title = "一般相対性理論",
  year: 2023
  month: 1
  key = "相対性理論",
  publisher = "岩波書店",
  address = "東京",
  series = "岩波文庫 ; 青(33)-934-3",
  ISSN/ISBN = "9784003393437 [4003393430]",
}