Oscillation matrices and kernels and small vibrations of mechanical systems  
Gantmakher, F. R. 
 - Rev. ed. 
 - Providence, R.I. :  AMS Chelsea Pub.,  2002 
 - viii, 310 p. ;  26 cm. 
<br/><br/><label>ISBN: </label>0821831712 (alk. paper)