WASET
Alajtal, A. , Edwards, H. , Elbagermi, M.. "Vibratinal Spectroscopic Identification of Beta-Carotene in Usnic Acid and PAHs as a Potential Martian Analogue". World Academy of Science, Engineering and Technology, Open Science Index 85, International Journal of Bioengineering and Life Sciences (2014), 8(1), 50 - 53.