Jeffreys, Harold.  Sir. <br/><br/>
Methods of mathematical physics / 
by Sir Harold Jeffreys and Bertha Swirles (Lady Jeffreys). 
 - 3rd ed. [in pbk.]. 
 - Cambridge :  The University Press,  [1972],. 
 - viii, 718 p. 
<br/><br/><label>ISBN: </label>0521097231 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physics.<br/>Mathematical physics.