We try this google translation as an experiment. Please feel free to email us with any comments...


Dear Visitor,

Here you can find a choice of helpful literature about special issues around PNF. They are divided in several topics assorted in different submenu-items.

Enjoy it.



The IPNFA includes these PNF and PNF related texts for your reference/information and is not responsible for the content, scientific background and terminology used in these publications.

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