From Leonard A. Harris, Herbert S. Suer, William T. Skene and Roland J. Benjamin, "the stability of thin-walled unstiffened circular cylinders under axial compression including the effects of internal pressure", Journal of the Aeronautical Sciences, Vol. 24, No. 8, August 1957, pp. 587- 596
Unlike the incipient buckling pattern of unpressurized axially compressed cylindrical shells, the incipient buckling pattern of internally pressurized axially compressed cylindrical shells is axisymmetric if the internal pressure is high enough.
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