Alon Halevy is pretty big in the field of data integration. Some of my undergrad project was about improving certain aspects on his work on LAV integration. You might also find his work by Alon Levy instead of Halevy. If you want a theoretical view of the field, checkout Maurizio Lenzerini's work.

For a perspective/survey check this out: http://www.dis.uniroma1.it/~degiacom/didattica/semingsoft/ma...