Christensen, A. P. <br/><br/>
Fatigue tests of prestressed concrete pavements / by A. P. -Christensen and B. E. Colley. 

 - Skokie, Illinois : atories, Development Department 
 - [30] p. 
 - Bulletin D143 / Portland Cement Association, Research and D-evelopment Laboratories, Development Department .
<br/><br/> "Authorized reprint from Highway Research Record Number 239-, pp. 175-196 (1968)".