Martin Van Hoek has a done a couple of papers on "The Prehistoric Rock Art of Donegal" (Ulster Journal of Archaeology) Belfast City Library have them. He also did "the Spiral in British and Irish Neolithic Rock Art " & "The Rosette in British and Irish Rock Art". Avril Purcell wrote "RockArt Landscape of the Iveragh peninsula in "European Landscapes of Rock Art" .
Another writer who has published is Blaze o' Connor but I havn't read her yet . Enough there to keep you up for a couple of night s Hob not that you get much kip these days .