The Circle of Julia Domna and Christian Heresiology, in Studia Ephemeridis Augustinianum, 50 (1995), p. 237-248.

Was Hippolytus a Schismatic? in Vigiliae Christianae 49,3 (1995), p. 215-224.

Ligorio’s reconstruction of Hippolytus’ Statue and the recovery of the Hippolytan Corpus, in Medieval Codicology, Iconography, Literature, and Translation, Studies for Keith Val Sinclair, by P.R. Monks and D.D.R. Owen (Editors), (Leiden: E.J. Brill 1994).

Diogenes Laertios and the Apostolic Succession, in Journal of Ecclesiastical History, 44, 3 (1993), p. 367-389.

Hippolytus’ See and Eusebius’ Historiography, in Studia Patristica XI (Proceedings of the 11th Oxford International Conference on Patristic Studies) (Ed.) E. A. Livingstone (Peeters Press: Leuven 1993), p. 28-37.