If they really just reference another answer and aren't complete on their own (and don't add anything substantive), you could flag them, although I would just downvote them and leave a comment explaining it. You should only really flag non-answers, and these sound like real answers, just poor ones - although you haven't provided a specific example, so I'm making a few assumptions there.
Also, if you see a particular question getting a lot of pointless/noisy answers then flag the question itself for moderator attention and we'll either protect it or close/lock it if the situation seems particularly dire.
In general, don't be afraid to downvote anything that looks like crap. People may cry bloody murder over a downvote but in practice, they are just as vital as upvotes to maintain the quality of answers and thus the overall health of this community.