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International Journal of Applied Mathematics and Computer Science > 2011 > 21 > 3 > 423-430
International Journal of Applied Mathematics and Computer Science > 2010 > 20 > 4 > 619-635
International Journal of Applied Mathematics and Computer Science > 2011 > 21 > 3 > 423-430
International Journal of Applied Mathematics and Computer Science > 2010 > 20 > 4 > 619-635