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2. A. H. Gibson, Hydraulics and Its Applications [Russian translation], Gosénergoizdat (1934).
3. R. C. Kolf and P. B. Zielinski. The vortex chamber as an automatic flow-control device, Proc. ASCE,85, Nr HV 12 (1959).
4. A. D. Al'tshul', “Discharge of liquids with a high viscosity through orifices,” Neftyanoe Khozyaistva, No. 2 (1959).
5. M. Sh. Margolin, Suspension Device of a Current Meter for Measuring the Peripheral Velocities of Axisymmetric Circulation [in Russian], Author's certificate No. 200796 with priority from April 20, 1965.