On the analytical representation of direction :  an attempt applied chiefly ot solving plane and spherical polygons / 
edited by Bodil Branner 
 - Meddelelser :  Matematisk-Fysiske,  1999 
 - 143 p. :  map. ;  26 cm. 
 - Caspar wessel .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Polygons
<br/><br/><label>Dewey Class. No.: </label>516.15