Nihon bunpō kenkyū - Kuno, Susumu 1933- (Taishūkan Shoten, 1988)
"The stucture of the Japanese language (1972) ... kara 3-shō ... o sakujoshi, atarashiku 4-shō o kuwae ... ryōsho ni kyōtsū na shō mo honsho de wa Nihonjin dokusha o taishō to shite hajime kara kakinaoshita": p. iii