Robert Bruce, 4th ed., pp. 34–35 ^ Barrow, Robert Bruce, 4th ed., p. 430; Duffy, "Bruce Brothers and the Irish Sea World", p. 60 ^ Barrow, Robert Bruce, 4th
975. Bibcode: 1997A&A...318..975N. ^ Chyba, C. F.; Jankowski, D. G.; Nicholson, P. D. (1989). “Tidal Evolution in the Neptune-Triton System”. Astronomy