1. M. F. Barshtein and A. N. Zubkov, ?Transverse forces arising in the motion of an overhead crane,? in: Dynamics of Structures (B. G. Koronev, ed.) [in Russian], Stroiizdat, Moscow (1968), pp. 4?31.
2. É. Kamke, Handbook on Ordinary Differential Equations [in German], Chelsea Publ.
3. N. A. Kovalev, Lateral Vibrations of Moving Composite [in Russian], Transzheldorizdat, Moscow (1957).
4. V. A. Lazaryan, L. A. Dlugach, and M. L. Korotenko, Stability of Rail-Vehicle Motion [in Russian], Naukova Dumka, Moscow (1972).
5. G. M. Fikhtengol'ts, Course in Differential and Integral Calculus [in Russian], Vol. 1, Nauka, Moscow (1970).