Maybe from:
Ross, C.T.F., (2006), A Conceptual Design of an Underwater Vehicle, Ocean Engineering, Vo. 33, 2087-2104.
or maybe from:
Ross, C.T.F. & Humphries, M., (1993), The buckling of corrugated circular cylinders under uniform external pressure, J. Thin-Walled Structures, 17, 259-271.
or maybe from:
Ross, C.T.F. & Palmer, (1993), General instability of wedge-stiffened circular cylinders under uniform external pressure, J. of Ship Res., 37, 77-85.
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