1. Harris C.M., Crede CH.E. Shock and Vibration Handbook, Volume 1. Mc Graw –
Hill Book Company, 1961, p. 396, ISBN 60-16636
2. Geradin M., Rixen. Mechanical Vibrations, Wiley 1994, p. 411, ISBN 0-471-
93927-7
3. Thomson,W.T.-Dahlen,M.D.: Theory of VIBRATION with Applications,Prentice
Hall,New Jersey 1998,ISBN 0-13-651-068-X, 524 p.