1. May, D. M. "The Development of a Vortex Meter," M.S. thesis,1964, Pennsylvania State Univ., University Park, Pa.
2. Logan, A. H. "A Solution to the Vortex Breakdown Phenomenon in a Trailing Line Vortex," M.S. thesis,1966, Pennsylvania State Univ., University Park, Pa.
3. Sherrieb, H. E. "Decay of Trailing Vortices," M.S. thesis,1967, Pennsylvania State Univ., University Park, Pa.