Brain regions responsible for word retrieval, speech production and deficient word fluency in elderly people: a PET activation study. - Itaru F. Tatsumi; Michio Senda; Kenji Ishii; Masahiro Mishina; Masashi Oyama; Hinako Toyama; Keiichi Oda; Masayuki Tanaka 004; Yasuyuki Gondo (INTERSPEECH, 2000)