Collins, Adela Yarbro. “Numerical Symbolism in Jewish and Early Christian Apocalyptic Literature.” In Aufstieg und Niedergang der römischen Welt . Edited by W. Haase, and H. Temporini, II:21: 1221-87. 1984.
See also chapter 3 with the same title in Collins, Adela Yarbro. Cosmology and Eschatology in Jewish and Christian Apocalypticism. Brill’s Scholar’s List. 1996; reprint, Leiden: Brill, 2000, pp. 55-138. I could not find any information as to whether this chapter is identical to the ANRW contribution or perhaps an updated version.
A significant contribution to the issue of symbolism.