Supardi, Supardi. “Finding the Optimum Curvature Strains and Elasticity Constant K_4 for Nematic Liquid Crystals Using Minimization of the Frank-Oseen Free Energy Density Functional”. Jurnal Sains Dasar, vol. 2, no. 2, Apr. 2015, doi:10.21831/jsd.v2i2.3296.