1. Bond, H.E. 1989, in IAU Symp. No. 131, Planetary Nebulae, ed. S. Torres-Peimbert(Dordrecht, Reidel), p. 251
2. Bond, H.E., Ciardullo, R., Fleming, T.A., and Grauer, A.D. 1989, in IAU Symp. No. 131, Planetary Nebulae, ed. S. Torres-Peimbert (Dordrecht, Reidel), p. 310
3. Bond, H.E., Ciardullo, R., and Meakes, M.G. 1989, BAAS, 21, 789
4. Bond, H.E., and Grauer, A.D. 1987, in IAU Colloq. No. 95, The Second Conference on Faint Blue Stars, ed. A.G.D. Philip, D.S. Hayes, and J.W. Liebert (Schenectady, L. Davis Press), p. 221
5. Bond, H.E., Liller, W., and Mannery, E.J. 1978, ApJ, 223, 252