1. Stream functions for three-dimensional flows;Giese;J. Math. Phys.,1951
2. Variational principles in hydrodynamics;Skobelkin;Soviet Phys. JETP,1957
3. On the stream functions in nonsteady three-dimensional flow;Krzywoblocki;J. Aeronaut. Sci., Readers' Forum,1958
4. Stream Functions in Three-Dimensional Flows;Yih;Houille Blanche,1957
5. Three-dimensional stream functions in terms of Quaternions;Krzywoblocki;Aplikace Matematiky,1963