This is the website that hosts the papers from Lawrence Physics Inc.:
http://www.lawrencevilleplasmaphysics.com/index.php?option=com_content&view=article&id=68&Itemid=86
Check the hyperlinks from Eric’s paper. If you delete the .pdf file name, you get linked to that website. So, Eric probably authorized that website.
BTW, it is common to the authors of papers to host the papers they publish, even if they are from Nature. For example, this one:
http://rogers.matse.illinois.edu/publications.html
