Have you any idea what's happened to user Vladimir Kalitvianski?
I like taking a look at some of his recent comments on his user page, because of the way they generate interesting discussions, but I can't find him anymore.
I've looked through his review paper here:
A Toy Model of Renormalization and Reformulation
http://www.physicsoverflow.org/20239/a-toy-model-of-renormalization-and-reformulation?show=20239#q20239
But he seems to have been strangely anonymized.