He was said to be the author of Kagakusho (a book on the study of waka poems) called "Wakasakushiki" (also known as "Kisenshiki"), but it is considered today to be an apocryphal book of the late Heian period.
歌学書『倭歌作式』（一名『喜撰式』）の作者とも伝えられるが、今日では平安後期の偽書（仮託書）と見られている。