Journal Article
期刊信息: Communications in Mathematical Sciences (CMS) Vol 5, No. 4, December 2007
CAM-Net Digest, Vol. 4 (2007), Iss. 26 : p. 6
Journal Article
期刊信息: Science in China Ser A: Mathematics 2007 No.12
CAM-Net Digest, Vol. 4 (2007), Iss. 26 : p. 7
