1. R. Gorecki. Simplifying Control Algorithm, AGH Electrotechnical Notebooks, Krakow, 1996 (in Polish).
2. H. Gorecki. Analysis and Synthesis Control Systems with Time Delay, PWN, Warszawa, 1971 (in Polish).
3. H. Gorecki, S. Fuksa, P. Grabowski, A. Korytowski. Analysis and Synthesis of Time-delay Systems, JohnWiley, London, 1989.
4. J.E. Marshall., Gorecki H., Walton K., Korytowski A., Time-Delay Systems: Stability and Performance Criteria with Applications, Ellis Horwood, London, 1992.