1. On the natural vibrations of tapered beams with attached inertia elements;Auciello;J. Sound and Vibration,1997
2. The free vibration of a type of tapered beam;Zhou;Computer Methods in Applied Mechanics and Engineering,2000
3. Closed-form solutions for natural frequency for inhomogeneous beams with one sliding support and the other pinned;Elishakoff;J. Sound and Vibration,2000
4. Dynamiczne funkcje grena w analizie drgań wlasnych ciąlych i dyskretno-ciąlych ukladów mechanicznych;Kukla;Monografie,1999
5. Application of the Green's function method in free vibration analysis of non-uniform beams;Kukla;Scientific Research of the Institute of Mathematics and Computer Science,2005