Trifunac, M. D. <br/><br/>
Dependence of the duration of strong earthquake ground moti-on on magnitude, epicentral distance geologic conditions at- the recording station and frequency of motion / by M. D. T-rifunac and B. D. Westermo. 

 - Los Angeles, Calif. : eering 
 - 65 p. 
 - Report; no. CE 76-02 .