1. Buzdugan, G., Mihailescu, E., and Rades, M., 1986, Vibration measurement, Martinus Nijhoff Publishers, Romania.
2. Olsen U., Vibrations in Blowers and Fans, Schenck Technical Note C1207e.
3. Eck, B., 1957, Ventilatoren, Springer.
4. Errett, A. J., Solecki, J. S., and Tuttle, D. G., 1985, “Modal Analysis of Airfoil Fan Wheels,” Proc., 3rd Int. Modal Anal. Conf., Orlando, Florida, pp. 198–204.
5. ISO 10816, 1996, “Mechanical Vibration - Evaluation of Machine Vibration by Measurements on Non-Rotating Parts” - Part 3: Industrial Machines with Normal Power above 30 kW and Nominal Speeds Between 120 and 15,000 rpm when Measured In Situ.