PHARMACEUTICAL PATENT CHALLENGES AND THEIR IMPLICAITONS FOR INNOVATION AND GENERIC COMPETION https://webcache.googleusercontent.com/search?q=cache:yLpg8EbHLekJ:https://www.aeaweb.org/conference/2015/retrieve.php%3Fpdfid%3D1203+&cd=12&hl=en&ct=clnk&gl=us I wonder if they ever cleaned up all of the spelling errors... this doc is full of them, but, subject of interest.