Here is a hand where I advocated limp raising TT UTG in a WPT event. The hand ended up getting limped around but if I remember correctly there was some decent discussion on limp raising mid pairs 15-20bbs deep. There were definitely good players disagreeing with me but I definitely feel that the limp-shove is optimal here.
TT UTG at WPT Niagra Main Event
In that thread I was pointed to a Sklansky thread discussing the same topic
Sklansky thread on TT UTG with 20bb stacks