Ed Miller is one of my favorite writers in Card Player magazine. In the latest issue (see scan above), he discusses continuation betting.
"When you raise preflop and get called by a competent player who has position on you, you should check many flops. Most players bet too often in this situation . . . if you checked half the time, it wouldn't be too much.
"You shouldn't check only with hands you plan to give up. You should check planning to check-call with good hands. You should check planning to check-raise good hands. And you should also check-raise bluff.
"When you play this way, you put a lot of pressure on other players."