@techreport{oai:repository.dl.itc.u-tokyo.ac.jp:00042626, author = {Takahashi, Akihiko and Tsuzuki, Yukihiro}, month = {Feb}, note = {application/pdf, 本文フィルはリンク先を参照のこと}, title = {A New Improvement Scheme for Approximation Methods of Probability Density Functions}, year = {2014} }