1. Boys C. V. 1959 Soap bubbles and the forces which mould them. G arden City New Y ork; D oubleday and Co. Inc.
2. C handrasekhar S. 1961 Hydrodynamic and hydromagnetic stability. Oxford: The Clarendon Press.
3. Proc. Roy;Donnelly R .;Soc. A,1964
4. Proc. Roy;Donnelly R .;Soc. A,1965
5. Rayleigh Lord 1945 The theory of sound volume n (2nd ed.). New York: Dover Publications.