1. R. L. Cloud, ?Minimum-weight design for a radial nozzle on a spherical shell?, Proc. ASME, Ser. E, Applied Mechanics [Russian translation],32, No. 2 (1965).
2. E. Onat, ?Plastic failure of cylindrical shells under the effect of an axisymmetric load?, in: Collection of Translations ?Mekhanika?, [in Russian], No. 6 (34) (1955).
3. I. A. Birger and Ya. G. Panovko (editors), Strength Stability, and Vibrations. Handbook in Three Volumes [in Russian], Vol. 2, Izd. Mashinostroenie, Moscow (1968).
4. R. Kitching and H. Duffield, ?Stresses due to axial loads and internal pressure on forged nozzles in a spherical pressure vessel?, Inst. J. Mech. Sci.,6, No. 1 (1964).
5. R. Kitching and J. Perkins, ?Stress analysis of rim and ring reinforced openings in pressure vessels?, Nucl. Engng.,8, No. 85 (1963).