1. I.F. Silvera and J.T.M. Walraven,Phys. Rev. Lett. 44, 164 (1980).
2. M. Mertig, A.V. Levkovitch, V.G. Luppov and Y. Pilipenko,Rev. Sci. Instrum. 63, 2220, (1992).
3. G. Tastevin (this conference); M. Cornut and P.J. Nacher (this conference).
4. This matter is somewhat controversial for the case of a moving film. See for example V.M. Kontorovitch,Zh. Eksp. Teor. Fiz. 30, 805 (1956), translatedSov. Phys. JETP 3, 770, (1956); also D.L. Goodstein and P.G. Saffman,J. Low Temp. Phys. 18, 435 (1975); D.T. Eckholm and R.B. Hallock,J. Low Temp. Phys. 42, 339 (1981). The assumption that we make here is that the vapor facing the moving film has a uniform chemical potential: this should be true to a very good approximation, except perhaps when the film has become too thin.
5. J.O Hirschfelder, C.F. Curtiss and R.B. Bird,Molecular Theory of Gases and Liquids, Chapter 8, M. Goeppert Mayer ed., John Wiley & Sons (1964).