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Kibet, Ian Kiplagat; Sitienei, Shadrack Kipkoech; Juma, Thomas Otieno(International Journal of Scientific and Research Publications, Volume 10, 2020-06-06)
Nyakundi, Joseph Ondari; Ombui, Jackson Nyarongi; Wanyonyi, Wycliffe Chisutia; Mulaa, Francis Jakim(Journal of the American Leather Chemists Association, 2021-12-23)