Ninth E.C. photovoltaic solar energy conference 
/ Proceedings of the international conference, held at freiburg, fed. rep. of Germany, 25-29 september 1989 
 - Netherland:   Kluwer Academic Publishers,   1989 
 - xxxi, 1217p. 
<br/><br/><label>ISBN: </label>0-7923-0497-7 
<br/><br/><label>Universal Decimal Class. No.: </label>620.91(082.2)   / M9