Academic Legal Writing: Law Review Articles, Student Notes, Seminar Papers, and Getting on Law Review, NYU Law LibrarySee preemption by case law: "I. Finding What to Write About (The Claim) - I. Topics and Structures You Should Generally Avoid - Topics That the Supreme Court or Congress is Likely to Visit Shortly"
By articles: "IX. Tips of Researching - B. Understanding the Law - 3. Find other works on the topic (the literature search)"