I think the most interesting article for me personally was Damon Root's, which makes a case that abortion should actually be protected under the 9th amendment (the "catch all" amendment: "just because we didn't enumerate a right, doesn't mean the government can infringe on it").
The difficulty with unenumerated rights is it's very hard to establish exactly what they are. And, indeed, in this case you could certainly argue for the fetus' rights vs the mother's.