Chopra, Anil K. <br/><br/>
Frequency dependent stiffness matrices for viscoelastic hal-f plane foundations / by Anil K. Chopra, P. Chakrabarti, Ga-utam Dasgupta. 

 - Berkeley, Calif. : enter 
 - 125 p. 
 - Report ; No. UCB / EERC 75-22. .
<br/><br/> ".  "Sponsored by National Science Foundation Grant ATA74-20554-