Vallenas, José <br/><br/>
Concrete confined by rectangular hoops and subjected to axi-al loads / by Jose Vallenas, Vitelmo V. Bertero, Egor P. Po-pov 

 - Berkeley, Calif. : University of California, College of Engineering 
 - 114 p. 
 - Report ; No. UCB / EERC 77-13 .
<br/><br/> "A report on research sponsored by the National Science Fou-ndation".