Backus, George <br/><br/>
Foundations of geomagnetism / 
George Backus, Robert Parker, Catherine Constable 
 - Cambridge :  Cambridge University Press,  1996 
 - xiv, 369 p. :  ill. ;  23 cm. 
<br/><br/>References : p. 351-359 
<br/><br/><label>ISBN: </label>0521017335 (pbk.)  RM391.93 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geomagnetism<br/>Spherical harmonics