Technical examination - analysis. 

 - Londres-ENK :   International Institute for Conservation,   1971. 
 - páginas 124-126 
 - Irregular 
 - Vol. 8, no. 3(Jun.1970-1971) 
 - Art and archaeology technical abstracts    ;   Vol. 8, no. 3 .
<br/><br/> Stone and masonry. 
<br/><br/><br/>Inglés.