1. Crystal Physics of Interaction Processes;Mason,1966
2. Problems of Continuum Mechanics: N. I. Muskhelishvili 70th Birthday Volume;Mindlin,1961
3. The Variational Principles of Mechanics;Lanczos,1960
4. Variational Methods in Mathematical Physics;Mikhlin,1964
5. Variational Techniques in Electromagnetism;Cario,1965