1. Similarity analysis of partial differential equations;Na,1967
2. General group-theoretic transformations from boundary value to initial value equations;Na;NASA CR-61218,1968
3. General group-theoretic transformations from nonlinear to linear differential equations;Na,1969
4. Similarity solutions of partial differential equations by multiparameter Lie group;Na,1969
5. Hydrodynamics;Birkhoff,1950