1. A. Buchacz, A. Wróbel: The investigation of the piezoelectric effect of bimorph system and its practical application in level sensors, XII The Scientific conference, on vibroacoustics and vibrotechnique, Jachranka (2007), pp.63-66.
2. S. Bellert: Chosen works. PWN. Warszawa (1981).
3. A. Buchacz, A. Wróbel: The analysis of simple and complex piezoelectric systems, XVII Sympozjon The modelling in the mechanics, project N 502 071 31/3719, Wisła, 25-29 February (2008).
4. R.E.D. Bishop, G.M.L. Gladwell, S. Michaelson: Matrix analysis of vibration. WNT, Warszawa (1972).