1. Laminar boundary layers at a moving interface generated by counter-current gas–liquid stratified flow;Boyadjiev;International Journal of Multiphase Flow,1976
2. Numerical simulation of opposite currents;Boyadjiev;Journal of Theoretical Applied Mechanics,1992
3. S.A. Tersenov, Parabolic Equations with Changing Direction of Time, 1st ed., Science, Novosibirsk, 1985, p. 104
4. Nonlinear Equations from Changed Type;Larkin,1983
5. The hydrodynamics of certain two-phase flows. Part IV: Evaluation of some special functions;Boyadjiev;International Journal of Chemical Engineering,1971