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International Journal of Applied Mathematics and Computer Science > 2013 > 23 > 2 > 309-315
International Journal of Applied Mathematics and Computer Science > 2013 > 23 > 2 > 309-315
International Journal of Applied Mathematics and Computer Science > 2011 > 21 > 4 > 697-702
International Journal of Applied Mathematics and Computer Science > 2009 > 19 > 2 > 263-269