Web site: 岩堀長慶先生のご逝去を悼む (In memory of Prof. Iwahori Nagayoshi) . 寺田至 (Itaru Terada) . Japanese . July 2011 . dead . https://web.archive.org/web/20160304062906/http://repository.dl.itc.u-tokyo.ac.jp/dspace/bitstream/2261/44177/1/rgn43_2_7.pdf . 2016-03-04.