A practical introduction to PHIGS and PHIGS plus/ 
T. L. J. Howard ... (et al.). 
 - Wokingham, Eng.:  Addison-Wesley,  1991. 
 - 339 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>0201416417 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer graphics