1) BRAUN-BLANQUET J. Pflanzensoziologie : Grundzuge der Vegetationskunde.. Springer-Verlag. (1964) vol.14+865,
2) DARWIN C. On the origin of species by mean of natural selection or the preservation of favoured races in the struggle for life.. John Murray. (1859) vol.9+502,
3) HAYASHI I. Scondary succession of herbaceous communities in Japan : a case study in Sugadaira, Central Japan.. Bull. Sugadaira Montane Res. Cen. Univ. of Tsukuba. (1991) vol.12, p.1-12.
4) ITOW S. Phytosociological studies on grassland vegetation in western Japan. Phytocoenologia. (1974) vol.1, p.306-338.
5) NUMATA M. Ecology of grasslands in Japan.. J. Coll. of Art. and Sci., Chiba University. (1961) vol.3, p.327-342.