"Kentaro Saji,Masaaki  Umehara,Kotaro Yamada","Singularities of Blaschke normal maps of convex surfaces",,"C. R. Math. Acad. Sci. Paris",,"Vol. 348","No. 11-12","Page 665-668",2010,June
"Kentaro Saji,Masaaki Umehara,Kotaro Yamada","The duality between singular points and inflection points on wave fronts",,"Osaka J. Math.",,"Vol. 47","No. 2","Page 591-607",2010,Apr.