Alrawi, Akram T., et al. “Determination of the Optimum Conditions for Ethanol Production from Whey by Utilization the Local Isolate Kluyveromyces Sp”. Journal of Biotechnology Research Center, vol. 3, no. 1, Jan. 2009, pp. 63-71, doi:10.24126/jobrc.2009.3.1.49.