Where to start to learn about free boundary problems?

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I am interested in analysis of PDEs in free boundary problems. Please recommend some sources for me to learn about this.

I would prefer Sobolev space setting as opposed to Holder spaces.

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I would recommend (without any reservations)

A Geometric Approach to Free Boundary Problems, by Luis Caffarelli & Sandro Salsa,

as both the authors are currently among the leaders in the area.

I would also recommend a good and pleasant reading by Avner Friedman:

http://www.ams.org/notices/200008/fea-friedman.pdf

It is to be noted that A. Friedman's book on the same topic (now in Dover edition) is where I learned (I am not an expert though). Nevertheless, it is not a reader friendly text.