Dear Sir/Madam, One of our faculty needs following article. If your library has access to it, please send it. http://www.worldscientific.com/doi/pdf/10.1142/S021759081450009X Regards, -- *Pritam Kumar Paul* *Librarian* *K K Das College, Garia* *Kolkata-700084* -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.