* [https://web.archive.org/web/20130616221302/http://www.pentrace.net/penbase/Data_Returns/full_article.asp?id=296] Quarto articolo sulla galalite | * [https://web.archive.org/web/20130616221302/http://www.pentrace.net/penbase/Data_Returns/full_article.asp?id=296] Quarto articolo sulla galalite |