@article{KawakatsuOkiTamuraetal.2007,
  author    = {Masaharu Kawakatsu and Iwashiro Oki and Sachiko Tamura and Hisao Sugino},
  title     = {Studies on the morphology, karyology. and taxonomy of the Japanese freshwater planarian Dugesia japonica Ichikawa et Kawakatsu : with a description of a new subspecies, Dugesia japonica ryukyuensis subspec. nov.},
  journal   = {Bulletin of Fuji Women's College},
  volume    = {2. Ser. 14},
  pages     = {81 -- 126},
  year      = {2007},
}