Itoyama, H.
Department of Mathematics and Physics, Graduate School of Science, Osaka City University, Japan
Osaka City University Advanced Mathematical Institute (OCAMI), 3-3-138, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
itoyama@sci.osaka-cu.ac.jp; Yoshioka, R.
Osaka City University Advanced Mathematical Institute (OCAMI), 3-3-138, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
yoshioka@sci.osaka-cu.ac.jp; Oota, T.
Osaka City University Advanced Mathematical Institute (OCAMI), 3-3-138, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
toota@sci.osaka-cu.ac.jp
(2015-01-26)