The field of "p versus np" is seldom being touched by researchers, since no one wanna spend his/her time on an unknown ending research program. What I mean maybe one could hardly find a published paper in recent years. What do you expect the author to cite? If you want to get an overview about the paper, you may watch this: http://www.youtube.com/watch?v=NYWgrjWQx60&feature=youtu...