Syed Zain SF, Ahmad N, Zainuddin MZ. Helium λ 4009.27 Å Phase Variation in Alpha Virginis. Malaysian J. Sci. [Internet]. 2007 Aug. 30 [cited 2024 Dec. 23];26(2):143-9. Available from: http://jummec.um.edu.my/index.php/MJS/article/view/8082