Gunn John: Karst cathcment protection : The Cuilcagh Mountain Park initiative, county Fermanagh, Northern Ireland. In: Acta Universitatis Szegediensis : acta geographica, (36). pp. 121-133. (1999)
Lowe David J.; Gunn John: The role of strong acid in speleo-inception and subsequent cavern development. In: Acta Universitatis Szegediensis : acta geographica, (34). pp. 33-60. (1995)