1. C. T. Lane, Superfluid Physics, McGraw-Hill Book Co., New York (1962).
2. K. R. Atkins, Liquid Helium, Cambridge University Press, Cambridge (1959).
3. J. Wilks, The Properties of Liquid and Solid Helium, Clarendon Press, Oxford (1967).
4. E. M. Lifshitz and E. L. Andronikashvili, A Supplement to Helium, Consultants Bureau, Inc., New York (1959).
5. F. London, Superfluids, Volume II, Macroscopic Theory of Superfluid Helium, John Wiley and Sons, New York (1954).