Kozhoukharova, ZH., and S. Slavchev. “Concentration-Dependent, Surface-Tension Driven Instability in a Horizontal Liquid Layer With a Deformable Free Surface”. Engineering Transactions, vol. 37, no. 3, Oct. 1989, pp. 403-14, https://et3.ippt.pan.pl/index.php/et/article/view/1674.