Lytton, R.L. <br/><br/>
Flexible pavement design and management : systems approach -implementation / R.L. Lytton , W.F. McFarland and D.L. Scha-fer. 

 - Washington, D.C. : TRB 
 - 53 p. 
 - Research Program Report ; 160 / Transportation Research Boa- rd .