Demmler, M. I., A. L. Camerlengo, M. Z. M. S., and M. L. Husain. “A C-F-L Condition for the Gravity Wave and the Inertial-Gravity Waves Using an Arakawa D Lattice”. Malaysian Journal of Science, vol. 16, no. 2, June 1995, http://mojes.um.edu.my/index.php/MJS/article/view/4789.