Finbar Murphy, E., J. Weatherington-Rice, A. D. Christy, and A. Hottmann. “Groundwater in Relation to Fractured till”. Ekistics and The New Habitat, vol. 69, no. 415-417, Dec. 2002, pp. pp. 227-233, http://ekisticsjournal.org/index.php/journal/article/view/341.