W. Frazer, “Notes on Incised Sculpturings on Stones in the Cairns of Sliabh-na-Calliaghe, near Loughcrew, County Meath, Ireland, with Illustrations from a series of Ground-Plans and Water-Colour Sketches, by the late G V Du Noyer,of the Geological Survey of Ireland”, PSAS, vol. 27, pp. 294–340, Nov. 1893.