d-bar literature

Krantz's book (Function theory of SCV) has a whole chapter with detailed treatment of the question of weighted L2 spaces, d-bar operator, and regularity. It is the same approach as in Hormander's book ,but with much more detail. You may also want to consult Bo BERNDTSSON's lecture notes, which are more leisurely:

http://www.math.chalmers.se/~bob/7nynot.pdf