D, Beeger. <br/><br/>
Connections between petrographical properties and the origin of patinas on facades of quartz sandstones in GRD. 

 - Strasbourg-FR :   Universite de strasbourg institut de geologia ,   1983. 
 - páginas 35-36 :   Ilustraciones blanco y negro 
 - Irregular 
 - (May.1983) 
 - News letter    .
 - Universite de strasbourg institut de geologia . .