1. Correlation Methods of Estimating Radiated Acoustic Power;Arai,1968
2. Bruel & Kjaer Magazine. B&K no. 3, 1995.
3. Correlation methods of measurement of sound power in near field conditions;Czarnecki;Archives of Acoustics,1976
4. T. Domagała, W. Kollek: Potential Applications of Energetistic Techniques to Diagnosis of Acoustic Condition of Hydraulic Machinery (in Polish). Series: Reports, No. S-058/97, Wrocław University of Technology, Wrocław 1997.
5. Investigations and Location of Sources of Internal and External Noisiness in Jelcz Bus and Development of Method of Noisiness Reduction (in Polish);Domagała,1998