On"ioie(s)"Used in Representing Paradise of St. Patrick's Purgatory. Research Reports of Fukui National College of Technology-the Humanities and Social Science. 2000. 34. 17-25
On Some Topographical Motifs of Purgatory, Hell and Paradise in the Middle Ages. Research Reports of Fukui National College of Technology-the Humanities and Social Science. 2000. 34. 27-32