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International Journal of Applied Mathematics and Computer Science > 2011 > 21 > 2 > 363-377
International Journal of Applied Mathematics and Computer Science > 2009 > 19 > 3 > 399-412
International Journal of Applied Mathematics and Computer Science > 2011 > 21 > 2 > 363-377
International Journal of Applied Mathematics and Computer Science > 2009 > 19 > 3 > 399-412