1. Bleich F. etal1950 D.C.: U.S. Government Printing Office. Themathematical theory of vibration in suspension bridges. Washington
2. Irvine H. M. 1974 Dynamics Lab. Rep. DYNL-108 California Institute of Technology.
3. Qu. Jl Mech. appl;Pugsley A. G.;Math. 2, part,1949
4. Rannie W. D. & von Karman T. 1941 The failure of the Tacoma Narrows Bridge. Federal Works Agency appl. vi.