@book{ BA16587026,
  author    = "Rohr, M. von (Moritz) and Czapski, Siegfried and Carl Zeiss (Firm : 1946) and Kanthack, R.",
  title     = "Geometrical investigation of the formation of images in optical instruments",
  publisher = "Printed and published for the Dept. of Scientific and Industrial Research by H.M.S.O.",
  year      = "1920",
  URL       = "https://ci.nii.ac.jp/ncid/BA16587026"
}