@book{ BA07387489,
  author    = "Greguss, Pál and Balkay, Bálint",
  title     = "Xylotomy of the living conifers",
  publisher = "Akadémiai Kiadó",
  year      = "1972",
  URL       = "http://ci.nii.ac.jp/ncid/BA07387489"
}