"Shoichi Fujimori,Udo Hertrich-Jeromin,Masatoshi Kokubu,Masaaki Umehara,Kotaro Yamada","Quadrics and Scherk towers",,"Monatshefte f?r Mathematik","Springer-Verlag",,,,2017,July
"Udo Hertrich-Jeromin,Yshihiko Suyama,Masaaki Umehara,Kotaro Yamada","A duality for conformally flat hypersurfaces",,"Beitraege zur Algebra und Geometrie / Contributions to Algebra and Geometry",,"Vol. 56","No. 2","  655-676",2015,Oct.