1. A. S. Livshits et al., A Two-Level Data-Acquisition Suite for Use with Nonstationary Turbulent Flows [in Russian], Dep. VINITI No. 5286-V-87, 22 July (1987).
2. J. S. Bendat and A. G. Piersol, Engineering Applications of Correction and Spectral Analysis, Wiley (1980).