1. Acrivos, A., Ahern, J. E. and Nagy, A. R., Report ARL 64-116 Aerospace Research Laboratories, WPAFB, Ohio (1964).
2. Hoelscher, J. F., M. S. Thesis, School of Engineering, AFIT, WPAFB, Ohio (1965).
3. Takahara, E. W., M. S. Thesis, School of Engineering, AFIT, WPAFB, Ohio (1966).