1. Ostachowicz W., Cartmell M.,
    Vibration analysis of a rotating beam with variable angular velocity,
    Machine Vibration, 5, pp. 189-198, 1996.

  2. Krawczuk M., Ostachowicz W., Żak A.,
    Analysis of natural frequencies of delaminated composite beams based on finite element method,
    An International Journal Structural Engineering and Mechanics, 4, pp. 243-255, 1996.