1. ^iljak, D.D., Nonlinear Systems, John Wiley and Sons, New York, 1969, pp.1-106.
2. Hurty, W.C. and Rubinstein, M.F., Dynamics of Structures, Prentice-Hall, Englewood Cliffs, N.J., 1964, pp.110-140.
3. Low-Cost Space Telescope Pointing Control System