7Hartnett, P. J. "Excavation of a Passage Grave at Fourknocks, Co. Meath." Proceedings of the Royal Irish Academy Section C: Archaeology, Celtic Studies, History, Linguistics, Literature 58 (1956/1957): 212.
More recently archaeologist Carleton Jones interpreted the evidence to indicate that the wooden beams presumed attached to a central post did indeed support the stones and capstone of a fully-corbelled roof. (Jones, Carleton. Temples of Stone: Exploring the Megalithic Tombs of Ireland. Cork: Collins, 2007. 94.)