Simply trying to put Naimi "Les entiers sans facteurs carré" into Google leads to a PDF file which contains the corresponding volume of Publications Mathématiques d'Orsay - including this article.
It seems that some other volumes are available on the same site - I have tried a few similar links: 38, 37, 26, 15, 04. However, I failed to find a page which contains some kind of archive linking to those pdf-s. (Still, Google indexed them, so the crawler must have discovered them somewhere.)