1. AWWA (2017) American Water Works Association. Standard methods of analysis for the Examination of Water and Wastewater, 23rd Edition, USA.
2. Bienkiwicz K (1983) Physical chemistry of leather making. R.E. Kriger publishing company, Malabar, Florida
3. Bitcover EH, Jones HW, Windus W (1970) The unhairing activity of sodium phosphorothioate. J Am Leather Chem Assoc 65:105–106
4. Burnett CL, Bergfeld WF, Belsito DV, Klaassen CD, Marks JG, Shank RC, Slaga TJ, Snyder PW, Andersen FA (2009) Cosmetic ingredient review expert panel. Int J Toxicol 28(4 Suppl):68–133
5. Costa A, Basile AVD, Medeiros VLS, Moisés TA, Ota FS, Palandi JAC (2010) 10% thioglycolic acid gel peels: a safe and efficient option in the treatment of constitutional infraorbital hyperpigmentation. Surg Cosmet Dermatol 2(1):29–33