As stated in the post title,
I am looking for papers/publications with sets of experimentally-validated PPI interactions to be used in a computational biology research project .
Alternatively, what wet-lab techniques/stringent criteria give the most reliable PPI interactions?
Looking forward for your help! Dan
Two databases you might use: http://string-db.org/
http://mint.bio.uniroma2.it/mint/Welcome.do
(Since you didn't specify which organism I'll be ignorant and assume everyone works on humans. Although those databases are not specific for humans per se.)