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3. Investigations of high stiffness thrust gas bearing;Kazimierski,1981
4. Brzeski, L., et al. Polish patent P-167778, 1975; USA patent 3960414, 1976; British patent 1467911, 1977; USSR patent 645614, 1979.
5. Static performance and stability of a self controlled restrictor gas lubricated thrust bearing;Tully,1976