Shortley, George H. <br/><br/>
Numerical solution of Laplace's and Poisson's equations with applications to photoelasticity and torsion / 
George Shortley, Royal Welle, Bernard Fried. 
 - Rev. ed 
 - Columbus,  1942. 
<br/><br/><label>Subjects--Index Terms: </label>მათემატიკა განტოლებები