* [http://www.fountainpennetwork.com/forum/index.php?s=c45f3e9adbdca24ea62226e4eabdbc10&showtopic=14741] A FPN article
* [http://www.fountainpennetwork.com/forum/index.php?s=c45f3e9adbdca24ea62226e4eabdbc10&showtopic=14741] A FPN article
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* [http://www.fountainpennetwork.com/forum/index.php/topic/288564-osmia-882-supra-question/] An interesting discussion with some historical information