Modifiche

{{CronoModello|Visofil}}

{{CronoModello|Visofil}}

== Riferimenti esterni ==

== Riferimenti esterni ==

* http://www.penpractice.com/page9.html

* [http://www.penpractice.com/page9.html] Articolo di Laurence Oldfield

* http://www.penhero.com/PenGallery/MabieTodd/MabieToddVisofilSystem.htm

* [http://www.penhero.com/PenGallery/MabieTodd/MabieToddVisofilSystem.htm] Articolo di Jim Mamoulides e Laurence Oldfield sul modello

==Note==

==Note==

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