Hognestad, Eivind. <br/><br/>
Ultimate strength of reinforced concrete in american design- practice / by Eivind Hognestad. 

 - Skokie, Illinois. : atories, Development Department 
 - 19 p. 
 - Bulletin D12 / Portland Cement Association, Research and De-velopment Laboratories, Development Department .
<br/><br/> "Authorized reprint from Proceedings of a Symposium of the - Strength of concrete structures, London, May. 1956."