Zienkiewicz, O. C <br/><br/>
The finite element method, vol.1 
 the basis 

 - 5th.ed. 
 - Oxford  Butterworth-Heinemann  2000 
<br/><br/><label>ISBN: </label>0750650494 
<br/><br/><label>LC Class. No.: </label>TA 347.F5 Zie