@article{oai:repository.dl.itc.u-tokyo.ac.jp:00000124,
 author = {TAKEUCHI, Kazuhiko and TSUNEKAWA, Atsushi and IKEGUCHI, Hitoshi},
 journal = {Geographical reports of Tokyo Metropolitan University},
 month = {},
 note = {application/pdf},
 pages = {269--287},
 title = {Numerical classification of natural regions of Japan},
 volume = {25},
 year = {1990}
}