Barrett, A. N. <br/><br/>
Spatial structure and the microcomputer  selected mathematical techniques 
A. N. Barrett and A. L. Mackay 
 - London  MacMillan  1987 
 - 204 p. : ill. ; 23 cm. 
<br/><br/>p. 200-201 
<br/><br/><label>ISBN: </label>0333392841 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geometry--Data processing<br/>Microcomputers