@book{ BA65858491,
  author    = "坂上, 昭一  and 井上, 民二 ",
  title     = "Stingless bees of the Genus Trigona (Subgenus Trigonella) with notes on the reduction of spatha in male genitalia of the Subgenus Tetragonula (Hymenoptera, Apidae)",
  publisher = "Entomological Society of Japan",
  year      = "1987",
  URL       = "https://ci.nii.ac.jp/ncid/BA65858491"
}