المؤلفون: Hall, Valerie, Wastegaard, S., Hannon, G.E., Van Den Bogaard, C., Pilcher, Jonathan, Sigurgeirsson, J.R., Hermanns-Audottir, M.

المصدر: Hall , V , Wastegaard , S , Hannon , G E , Van Den Bogaard , C , Pilcher , J , Sigurgeirsson , J R & Hermanns-Audottir , M 2003 , ' Rhyolitic tephra horizons in northwestern Europe and Iceland from AD 700s-800s: a potential alternative for dating first hman impact ' , The Holocene , vol. 13 , pp. 277-283 .

الاتاحة: https://pure.qub.ac.uk/en/publications/11fd086a-a17d-4cc7-a5ee-600c808460ba