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Mathematical and Computer Modelling > 2011 > 54 > 11-12 > 3076-3082
Computers and Mathematics with Applications > 2011 > 62 > 12 > 4479-4485
Mathematical and Computer Modelling > 2011 > 54 > 11-12 > 3076-3082
Computers and Mathematics with Applications > 2011 > 62 > 12 > 4479-4485