1. den Hartog, J.P.: Mechanical vibrations, (McGraw-Hill 1949)
2. Simpson, A.: ‘Oscillations of catenaries and systems of overhead transmission lines’, 1963, Ph.D. Thesis, University of Bristol (Vol. I)
3. Hoerner, S.F.: Fluid dynamic drag, 1958),published by the author
4. Routh, E.J.: Advanced rigid dynamics, 6th edn(Macmillan 1905)