Brummelen, Glen Van. <br/><br/>
Heavenly Mathematics :   The Forgotten Art of Spherical Trigonometry/ 
Brummelen, Glen Van. 
 - Newjersey:  Princeton,  c2013. 
 - xvi,192p. 
<br/><br/><label>ISBN: </label>9780691148922 
<br/><br/><label>Dewey Class. No.: </label>516.24   / BRU/H