Zainuddin, Mohd Zambri, Noradni Azman Abd Aziz, Adibah Arif, Nazhatulshima Ahmad, and Saedah Haron. 2006. “Astronomical Seeing Measurement of Two Observatory Sites in Malaysia: The DIMM Method”. Malaysian Journal of Science 25 (1):129-35. https://samudera.um.edu.my/index.php/MJS/article/view/8279.