9Yigit A S, Ulsoy A G, Scott R A. Spring-dashpot models for the Dynami es of radially rotating beam with impact[J] . Journal of Sound and Vibration, 1990,142(3):125-131.
10John H. Mat hews. Computer Derivations of Numeri- cal Differ entiation Formulae[J]. Mat hematies Educa- tion in Science and Technology, 2003,34(2):280-287.
