Ballesteros, Porfirio <br/><br/>
Nonlinear dynamic buckling of an imperfect spherical concre-te shell / Porfirio Ballesteros 

 - Darmstadt, [ ] : IASS 
 - [14] p. 
<br/><br/> "Contributions to the IASS Symposium 1978 Nonlinear behavio-ur of reinforced concrete spatial structures, july 3rd - 7t-h in Darmstadt".