On the medieval period materials on kohitsu (ancient calligraphy) centering on waka composed and written by the poet. Idemitsu Museum of Arts journal of art historical research. 2010. 16. 31-53
A thought on "Kongoin-gire" and related detached segments: re-consideration on Kohitsu-gire with Chirashi-gaki style calligraphy on decorated paper. Idemitsu Museum of Arts journal of art historical research. 2009. 15. 67-88
On "Tonsho-ji horaku ichinichi senshu tanzaku (poems on tanzaku paper composed on the day of the religious gathering at Tonsho-ji Temple)": a study on and a collection of already known and newly discovered materials. Idemitsu Museum of Arts journal of art historical research. 2006. 12. 135-165