1. Lund, J. W., ?Self-excited, stationary whirl orbits of a journal in a sleeve bearing?, Ph.D. Thesis, Rensselaer Polytechnie Institute, NY, 1966.
2. Lund J. W. and Nielsen H. B., ?Instability threshold of an unbalaneed rigid rotor in short journal bearings?, Second International Conference on Vibrations in Rotating Machinery, C263/80, IMechE, Cambridge, September 1980.
3. Press, W., Flannery, B. P., Teukolsky, S. A. and Vetterling, W. T., Numerical Recipes, Cambridge University Press, 1986.
4. Capone G., ?Moti orbitali di un rotore rigido simmetrico su cuscinetti cilindrici lubrificati?, La Meccanica Italiana 199, 1986, 37?46.
5. Shaw J. and Shaw S. W., ?Instabilities and bifurcations in a rotating shaft?, Journal of Sound and Vibration 132(2), 1989, 227?244.