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International Journal of Applied Mathematics and Computer Science > 2011 > 21 > 4 > 639-648
International Journal of Applied Mathematics and Computer Science > 2011 > 21 > 3 > 467-478
International Journal of Applied Mathematics and Computer Science > 2011 > 21 > 4 > 639-648
International Journal of Applied Mathematics and Computer Science > 2011 > 21 > 3 > 467-478