Paul, Erich Robert. <br/><br/>
The milky way galaxy and statistical cosmology, 1890-1924 / 
Erich Robert Paul. 
 - Cambridge :  Cambridge University Press,  1993. 
 - 262 p. :  ill. ;  24 cm. 
<br/><br/>p. 246-254. 
<br/><br/><label>ISBN: </label>0521353637  RM126.85 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Milky Way--History.<br/>Cosmology--Statistical methods--History.<br/>Astronomy--Statistical methods--History.