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== External references ==
* http://www.pennaio.com/Sistemi_di_Riempimento.html
* http://www.richardspens.com/?page=ref/fillers/fillers.htm
* http://www.rickconner.net/penspotters/filling.html
* http://www.rickconner.net/penoply/filling.html
* http://www.vintagepens.com/filling_instructions_vintage_pens.shtml
* http://www.pentrace.net/penbase/Data_Returns/full_article.asp?id=266
* http://www.pentrace.net/penbase/Data_Returns/full_article.asp?id=259&tname=Technical
* http://www.penhero.com/PenGallery/Parker/ParkerDuofoldFiller.htm
* https://www.penexchange.de/english/sites/klassiker/kolbenfueller.html
* http://www.penexchange.de/english/sites/klassiker/pneumatik.html
* http://www.penexchange.de/english/sites/klassiker/selbstfueller.html
* http://kamakurapens.invisionzone.com/index.php?showtopic=1057&st=0&p=5173&#entry5173