1. Sommerfeld A (1964) Partial Differential Equations in Physics. Academic Press, New York, p 63
2. More PM and Feshbach H (1953) Methods of Theoretical Physics. McGraw-Hill, New York, p 676
3. Carslaw HS and Jaeger JC (1952) Conduction of Heat in Solids. Oxford University Press, London, 2nd ed, p 50
4. Landau LD and Lifshitz EM (1959) Fluid Mechanics. Pergamon, New York, p 183
5. Kapitza PL (1941) J Phys Moscow 4:181