The following references are cited in this example problem:
Bushnell, D. (1985). Computerized Buckling Analysis of
Shells. Springer, New York.
Dow, D. A. (November, 1965). Buckling and postbuckling tests of ring-stiffened
circular cylinders loaded by uniform external pressure. NASA
Technical Note NASA TN D-3111. Langley Research Center.
