7. Viterbo, F. , "Sul Problema Delia Robustezza di Cilindri Cavi 

 Rinforzati Transversalmente Sottoposti da Ogni Parte a Pressione 

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8. Pulos, J.G. and Salerno, V. L. , "Axisymmetric Elastic Defor- 

 mations and Stresses in a Ring-Stiffened, Perfectly Circular Cylindrical 

 Shell under External Hydrostatic Pressure," David Taylor Model Basin 

 Report 1497 (Sep 1961). See also PIBAL Report 171-A, Polytechnic 

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9. Timoshenko, S., "Theory of Elastic Stability," McGraw Hill Book 

 Co. , Inc. , New York (1936) pp. 439-441, 



10. Krenzke, M. A. and Short, R. D., "Graphical Method for Deter- 

 mining Maximum Stresses in Ring-Stiffened Cylinders under External 

 Hydrostatic Pressure," David Taylor Model Basin Report 1348 (Oct 1959). 



11. Lunchick, M. E. and Short, R. D., "Behavior of Cylinders with 

 Initial Shell Deflection," David Taylor Model Basin Report 1150 (Jul 1957), 



12. Short, R. D. and Bart, R., "Analysis for Determining Stresses in 

 Stiffened Cylindrical Shells Near Structural Discontinuities," David Taylor 

 Model Basin Report 1065 (Jun 1959). 



13. Keefe, R. F. and Overby, J. A., "An Experimental Investigation 

 of Effect of End Conditions on Strength of Stiffened Cylindrical Shells," 

 David Taylor Model Basin Report 1326 (Dec 1959). 



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