Zainuddin, M. Z., N. A. Abd Aziz, A. Arif, N. Ahmad, and S. Haron. “Astronomical Seeing Measurement of Two Observatory Sites in Malaysia: The DIMM Method”. Malaysian Journal of Science, vol. 25, no. 1, Apr. 2006, pp. 129-35, http://mojes.um.edu.my/index.php/MJS/article/view/8279.