Kipkosgei , Moses, et al. “ Determination of Diffusion Coefficients of L-(+) - Tartaric Acid in Water and Sodium Hydroxide Solutions at 25˚c ”. African Journal of Education,Science and Technology (AJEST), vol. 1, no. 1, Jan. 2013, pp. Pg 235-249, http://ajest.org/index.php/ajest/article/view/312.