I don't know of the specific papers offhand, but I know the topic of brown snake migration and hibernation is covered (with papers cited) in Ernst and Ernst, Snakes of the United States and Canada. It's a great book for just this kind of question, and I keep it along with my Ernst and Barbour for the turtles and my Petranka for the salamanders for when I'm wondering about natural history. I'd love to have something as good on anurans.
Billy
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