Ulrich, R.B. 1996, "Contignatio, Vitruvius, and the Campanian Builder", AJA 100,1, 137-151.
Comment: About the use of wood in floors of multistoried buildings. Examination of the traces of mezzanine floors from tabernae at Pompeii, Herculaneum and Ostia.
Ulrich, R.B. 2014, "Courtyard architecture in the insulae of Ostia antica", A companion to Roman architecture, 324-341, London.
Underwood D. 2013, "Reuse as archaeology: a test case for late antique building chronologies in Ostia", Field Methods and Post-Excavation Techniques in Late Antique Archaeology (L. Lavan - M. Mulryan edd.), 383-409, Leiden.