Janney, Jack R. <br/><br/>
Ultimate flexural strength of prestressed and conventionall-y reinforced concrete beams / by Jack R. Janney, Eivind Hog-nestad and Douglas Mc Henry. 

 - Skokie, Illinois : atories, Development Department 
 - [20] p. 
 - Bulletin D7 / Portland Cement Association, Research Develop-ment Laboratories, Development Department .
<br/><br/> "Authorized reprint from copyrighted Journal of the America-n Concrete Institute January 1956, Proceedings Vol. 52, p. - 601"