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Riga 318: Riga 318:  
* http://www.tryphon.it/pens/history.htm
 
* http://www.tryphon.it/pens/history.htm
 
* http://www.pentrace.net/2002/article032802_170.html
 
* http://www.pentrace.net/2002/article032802_170.html
 +
* http://xoomer.virgilio.it/leiacopi/williamson_fset.htm
    
== Zerollo ==
 
== Zerollo ==

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