Ehlers, Jurgen <br/><br/>
Relativity Theory and Astrophysics   : Galactic Structure 

 - Providence:  American Mathematical Society  1967 
 - 220p. :   il; 23 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astrofísica y Astronomía Descriptiva<br/>Astrofísica