See Toynbee, Death and Burial, chap. 3, esp. pp. 50–64, for a very good introduction to the subject; also on the question of Roman and Christian understandings of the refrigerium interim, see A. Stuiber, Refrigerium Interim, and a helpful review of the above by Toynbee, Journal of Theological Studies, n.s. 9 (1958), pp. 141–149. The term refrigerium interim seems to have been coined by Tertullian in his treatise De monogamia 100.10. The epitaphs containing these terms are mostly found in the triclia of San Sebastiano. For a full listing of these, see A. Silvagni and Antonio Ferrua, eds., Inscriptiones Latinae Christianae Veteres, 2nd ed., ed. J. Moreau, 3 vols. (Berlin: Weidmann, 1961).