REFERENCES
Ables, H.D.:
1971, Publ. U.S. Naval Obs. XX, part IV
Albada, T.S. van, Freeman, K.C.:
1978, in preparation
Audouze, J., Tinsley, B.M.:
1976, Ann. Rev. Astron. Astrophys. 14, 43
Bosma, A., Kruit, P.C. van der:
1978, in preparation
Bottinelli, L.:
1971, Astron. Astrophys. 10, 437
Brosche, P., Reinhardt, M.:
1977, Astron. Astrophys. 54, 531
Burbidge, G.R.:
1975, Astrophys. J. 196, L7
Burton, W.B.:
1976, Ann. Rev. Astron. Astrophys. 14, 275
Churchwell, E., Smith, L.F., Mathis, J.S., Mezger,
P.G., Huchtmeier, W.:
1977, Astron. Astrophys. (submitted)
Faber, S.M., Gallagher, J.S.:
1976, Astrophys. J. 204, 365
Gordon, M.A., Burton, W.B.:
1976, Astrophys. J. 208, 346
Hartwick, F.D.A., Sargent, W.L.W.:
1978, Astrophys. J. (in press)
Haschick, A.D., Burke, B.F.:
1975, Astrophys. J. 200, L137
Hunter, C., Toomre, A.:
1969, Astrophys. J. 155, 747
Jensen. E.B., Strom, K.M., Strom, S.E.:
1976, Astrophys. J. 209, 748
Kahn, F.D., Woltjer, L.:
1959, Astrophys. J. 130, 705
Kellmann, S.A., Black, D.C.:
1973, Astrophys. J. 184, 753
Krumm, N., Salpeter, E.E.:
1977, Astron. Astrophys. 56, 465
Lin, D.N.C., Lynden-Bell, D.:
1977, Monthly Not. R. Astr. Soc. 181, 59
Lockman, F.J., Brown, R.L.:
1978, Astrophys. J. (in press)
Lynden-Bell, D.:
1975, Vistas in Astronomy 19, 299
Nordsieck, K.H.:
1973, Astrophys. J. 184, 735
Okamura, S., Kanazawa, T., Kodaira, K.:
1976, Publ. Astron. Soc. Japan 28, 329
Okamura, S., Takase, B., Kodaira, K.:
1977, Publ. Astron. Soc. Japan 29, 567
Oort, J.H.: 1974, in
"The Formation and Evolution of Galaxies",
I.A.U. Symp. no. 58, ed. J.R. Shakeshaft, p 375
Ostriker, J.P., Peebles, P.J.E.:
1973, Astrophys. J. 186, 467
Ostriker, J.P., Peebles, P.J.E.., Yahil, A.:
1974, Astrophys. J. 193, Ll
Rubin, V.C., Kumar, C.K., Ford, W.K.:
1972, Astrophys. J. 177, 31
Sandage, A., Freeman, K.C., Stokes, N.R.:
1970, Astrophys. J. 160, 831
Sarazin, C.L.:
1976, Astrophys. J. 208, 323
Sargent, W.L.W.: 1977, in
"The Evolution of Galaxies and Stellar Populations",
eds. B.M. Tinsley & R.B. Larson, p 427
Sargent, W.L.W., Tinsley, B.M.:
1974, Monthly Not. R. Astr. Soc. 168, 19P
Schweizer, F.:
1976, Astrophys. J. Suppl. 31, 313
Searle, L.:
1971, Astrophys. J. 168, 327
Searle, L., Sargent, W.L.W.:
1972, Astrophys. J. 173, 25
Segalovitz, A.:
1976, Ph.D. dissertation, Leiden University
Shields, G.A., Tinsley, B.M.:
1976, Astrophys. J. 203, 66
Shostak, G.S.:
1977, Astron. Astrophys. 58, L31
Shostak, G.S.:
1978, Astron. Astrophys. (in press)
Simkin, S.M.:
1975, Astrophys. J. 200, 567
Smith, H.E.:
1975, Astrophys. J. 199, 591
Talbot, R.J., Arnett, W.D.:
1975, Astrophys. J. 197, 551
Tully, R.B.:
1974, Astrophys. J. Supp1. 27, 415
Turner, E.L.:
1976, Astrophys. J. 208, 304
Turner, E.L., Ostriker, J.P.:
1977, Astrophys. J. 217, 24
Vaucouleurs, G. de:
1958, Astrophys. J. 128, 465
Vaucouleurs, G. de:
1959, Astrophys. J. 130, 728
Vaucouleurs, G. de, Vaucouleurs, A. de, Corwin, H.G.:
1976, Second Reference Catalogue of Bright Galaxies,
University of Texas Press, Austin
Visser, H.C.D.:
1978, Ph.D. dissertation, University of Groningen
Webster, B.L.: 1977, in
"Topics in Interstellar Matter", ed. H. van Woerden,
p 243