I picked this up in Bantry yesterday;
skibbereenbookshop.com/books/irish-interest/751-the-sun-circles-by-jack-roberts.html
Not an academic volume, but very comprehensive and worth getting hold of if you’re interested in the circles of West Cork.
Anthony Murphy has a podcast here;
blog.mythicalireland.com/2013/09/podcast-interview-with-jack-roberts.html