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Mathematical Biosciences > 2015 > 270 > PB > 143-155
Asian Pacific Journal of Tropical Biomedicine > 2012 > 2 > 1 > 76-79
Mathematical Biosciences > 2015 > 270 > PB > 143-155
Asian Pacific Journal of Tropical Biomedicine > 2012 > 2 > 1 > 76-79