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Applied Mathematics and Computation > 2008 > 204 > 1 > 461-467
Applied Mathematics and Computation > 2004 > 149 > 1 > 277-298
Computers and Mathematics with Applications > 2002 > 43 > 6-7 > 671-680
Physics Letters A > 2001 > 292 > 1-2 > 100-106
Physics Letters A > 2001 > 282 > 1-2 > 18-22
Physics Letters A > 2000 > 277 > 4-5 > 212-218