Nilsen, D. “A Geometrical Speculation. The Twelfth Century Roof and Some Peculiar Aspects of the Ground Plan of Værnes Church, Norway”. Acta Ad Archaeologiam Et Artium Historiam Pertinentia, vol. 16, no. 2 N.S., Dec. 2017, pp. 39-61, doi:10.5617/acta.5684.