1. Experiments with a self-propelled body submerged in a fluid with a vertical density gradient
2. J. Wu, Hydronautics, Inc., Technical Report 231-4 (1965).
3. Mixed region collapse with internal wave generation in a density-stratified medium
4. C. C. Mei, inProceedings of the Twelfth International Congress of Applied Mechanics, edited by M. Hetenyi and W. G. Vincenti (Springer Verlag, Berlin, 1969), p. 321.