Ninth E. C. photovoltaic solar energy conference  proceedings of the International Conference, held at Freiburg, Fed. Rep. of Germany, 25-29 September 1989 / 
edited by W. Palz, G.T. Wrixon and p. Helm. 
 - Dordrecht :  Kluwer Academic Publishers,  1989. 
 - 1217 p. ;  31 cm. 
<br/><br/> At head tittle : Commission of the European Communities. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0792304977