1. Argue, A.N., and Kenworthy, C.M.: 1972, Mon. Not. Roy. Astron. Soc. 159, p. 31.
2. Carpenter, M.S.: 1977, Neighborhood Meeting on the Distance Scale, Yale University.
3. Carpenter, M.S.: 1979, personal communication.
4. Carpenter, M.S., Corbin, T.E., and Schmidt, R.E.: 1975, Bull.AAS 7, p.435. Corbin, T. E. 1974, Astron. J. 79, p. 885.
5. Corbin, T.E., Smith, D.L., and Carpenter, M.S.: 1975, Bull. AAS 7,p.337. Corbin, T.E.: 1979, personal communication.