Murtagh, Fionn. 2014. Thinking ultrametrically, thinking p-adically. In: Fuad Aleskerov; Panos M. Pardalos and Boris Goldengorin, eds. Clusters, Orders, and Trees: Methods and Applications: In Honor of Boris Mirkin's 70th Birthday. Springer, pp. 249-272. ISBN 978-1493907410 [Book Section]