Syed Zain, S. F., Ahmad, N. and Zainuddin, M. Z. (2007) “Helium λ 4009.27 Ã… Phase Variation in Alpha Virginis”, Malaysian Journal of Science, 26(2), pp. 143–149. Available at: https://samudera.um.edu.my/index.php/MJS/article/view/8082 (Accessed: 20 November 2024).