@article{oai:tokyo-metro-u.repo.nii.ac.jp:00003023,
 author = {オカ, シュウイチ and Oka, Shuichi},
 issue = {42},
 journal = {Geographical Reports of Tokyo Metropolitan University},
 month = {},
 note = {Based on physiognomical investigations in Dogo, Japan, it was proved that forests of the Oki Islands comprise a variety of vegetation types, ranging from cool temperate zone to warm temperate zone vegetation. These vegetation types were found to persist in a so-called intermediate temperate zone, where regions with a warmth index of less than 85℃ months (M) and a coldness index of more than -10℃ M meet. The presence of a variety of vegetation types in a mixed state was likely a result of the temperature environment and refuges formed when vegetation belts shifted following past climatic changes.},
 pages = {1--6},
 title = {Forest vegetation of the oki islands in the southwestern japan sea},
 year = {2007}
}