Technical examination - analysis. 

 - Londres-ENK :   International Institute for Conservation,   1972. 
 - páginas 139-142 
 - Irregular 
 - Vol. 9, no. 2(1972) 
 - Art and archaeology technical abstracts   ;   Vol. 9, no. 2 .
<br/><br/> Other natural and synthetic organic materials. 
<br/><br/><br/>Inglés.