Following in the footsteps of Gerhard Bersu at Freestone Hill and Stonyford, Co. Kilkenny : new contributions from magnetic surveys - Rassmann, Knut; Scholz, Roman; Voss, Hans-Ulrich; Ó Drisceoil, Cóilín; Cahill-Wilson, Jacqueline (Gebr. Mann Verlag, 2023)