1. N. M. Newmark "Computation of Dynamic Structural Response in the Range Approaching Failure " Proceedings of the Symposium on Earthquake and Blast Effects on Structures Los Angeles 1952 Published by Earthquake Engineering Research Institute.
2. S. Levy and W. D. Kroll "Errors Introduced by Step-by-Step Integration of Dynamic Response " National Bureau of Standards Report February 1951.
3. Some New Methods for the Numerical Integration of Ordinary Differential Equations;Fox L.;Proc. Camb. Philos. Soc.,1949
4. Vibration Problems in Engineering;Timoshenko S.;D. Van Nostrand Co., New York, first edition,1928