Kupfer, Helmut.  <br/><br/>
Behaviour of concrete under biaxial stresses /  
by Helmut Kupfer, Hubert K. Hilsdorf and Hubert Rusch 
 - Michigan :   American Concrete Institute  1969 
 - 12 p. 
<br/><br/> En Caja de Apuntes de Construcciones. Catedra Materiales  Publicado en ACI Journal, August 1969, Title No.62-52 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CONCRETO
<br/><br/><label>Universal Decimal Class. No.: </label>666.9