A. J. Mula Oboida, B.; Q. J. Al-Zubaidi, R.; H. S.Al-Haj Alawi, R. Extraction and Estimation of β-Carotene Pigment from Some Species of The Genus Rhodotorula and Study The Ability to Increas Their Production By Mutagenesis. IHJPAS 2017, 29 (1).