Mallory (J. P.): The fort of the Ulster Tales.
In Emania 12 (1994), pp. 28–38.
Provides citations and discussion of terms for 'fortification’, both permanent and temporary in the Ulster cycle: baile, borg, cathair, daingen, dind, dún, dúnad, les, ráth, búaile, caisel, doé, fuithirbe, forad, múr, sonn, táible, tor, costud, longphort, sosad.