REFERENCES
Burbidge, E.M., Burbidge, G.R.:
1975, The masses of galaxies, in
Galaxies and the Universe, Vol IX of Stars and Stellar
Systems, eds. A. and M. Sandage and J. Kristian, p.81
Chincarini, G., Walker, M.F.:
1967, Astrophys. J. 147, 407
Fricke, K.J., Reinhardt, M.:
1974, Astron. Astrophys. 37, 349
Gordon, M.A., Burton, W.B.:
1976, Astrophys. J. 208, 346
Huchtmeier, W.K.:
1975, Astron. Astrophys. 45, 259
Kruit, P.C. van der, Bosma, A.:
1978, Astron. Astrophys. (submitted)
Nordsieck, K.H.:
1973, Astrophys. J. 184, 719
Rogstad, D.H., Shostak, G.S.
1972, Astrophys.J. 176, 315
Rogstad, D.H., Lockhart, I.A., Wright, M.C.H.:
1974, Astrophys. J. 193, 309
Rots, A.H.:
1974, Ph.D. dissertation, University of Groningen
Rubin, V.C., Ford, W.K.:
1970, Astrophys. J. 159, 379
Rubin, V.C., Burbidge, E.M., Burbidge, G.R.,
Crampin, D.J., Prendergast, K.H.:
1965, Astrophys. J. 141, 759
Sancisi, R.: 1978, in
"The structure and properties of nearby galaxies", I.A.U. symp. no. 77
(in press)
Shostak, G.S.:
1973, Astron. Astrophys. 24, 411
Shu, F.H., Stachnik,. R.B., Yost, J.C.:
1971, Astrophys. J. 166, 465
Toomre, A.:
1963, Astrophys. J. 138, 385
Visser, H.C.D.:
1978, Ph.D. dissertation, University Groningen
Warner, P.J., Wright, M.C.H., Baldwin, J.E.:
1973, Monthly Not. R. Astr. Soc. 163, 163