1. G. Birkhoff,Hydrodynamics: A Study in Logic, Fact, and Similitude, Chap. IV.
2. L. I. Sedov, “Dimensional analysis” (in Russian).
3. The Rate of Growth of Vapor Bubbles in Superheated Water
4. A thorough analysis of the justification for this and other approximations is given by these authors in reference 1; see also M. S. Plesset, “Physical effects in cavitation and boiling,” ONR Symposium on Naval Hydrodynamics, Washington, 1956 (to be published).