Abdel-Ghaffar, Ahmed Mansour. <br/><br/>
analysis of the characteristics of a suspension bridge by a-mbient vibration measurements / by A.M. Abdel-Ghaffar and G-.W. Housner. 

 - Pasadena, Calif. : Research Laboratory 
 - 79 p. 
 - [Report] ; EERL 77-01 / CALTEC, Earthquake Engineering Rese-arch Laboratory .