See, e.g., Kurt Aland, Studien zur Uberlieferung des Neuen Testaments und seines Textes (Berlin: de Gruyter, 1967), p. 173ff.; and C. H. Roberts’s discussion of nomina sacra in his important book, Manuscript, Society and Belief in Early Christian Egypt (London: Oxford University Press, 1979), pp. 26–48.