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REFERENCES

  1. PEASE, F. G.: Astrophys. Journ. 46, 24-55 (1917); 51, 276-308 (1920).
  2. LUNDMARK, K.: Kgl. Sv. Vetensk. Handl. 60, No. 8 (1920). - Upsala Medd. 1926, No. 8; No. 16 = VJS 61, 254 (1926); 1927, No. 30; No.41 = VJS 63, 350 (1928).
  3. HOLMBERG, E.: Ann. Obs. Lund 1937, No. 6. - Medd. Lunds Astr. Observ., Ser. I 1954 No. 186.
  4. ZWICKY, F.: Experientia (Basel) 6, 441-445 (1950). Publ. Astronom. Soc. Pacific 64, 242-246 (1952). - Physics Today 6, No. 4, 7-11 (1953). - Phys. Blätter 9, 406 to 415 (1953).
  5. ZWICKY, F.: Ergebn. exakt. Naturw. 29, 344-385 (1955).
  6. ZWICKY, F.: Griffith Observer 17, No. 12 (1953).
  7. COUDERC, P.: L'Astronomie 68, 406-415 (1954).
  8. ZWICKY, F.: Publ. Astronom. Soc. Pacific 68, 121 (1956).
  9. ZWICKY, F.: Morphological Astronomy Heidelberg: Springer 1957.
  10. BAADE, W., and E. P. HUBBLE: Publ. Astronom. Soc. Pacific 51, 40-44 (1939).
  11. HUBBLE, E. P.: The Realm of the Nebulae. New Haven, Conn.: Yale University Press 1936.
  12. BAADE, W.: Astrophys. Journ. 100, 147 (1944).
  13. HUMASON, M. L., N. U. MAYALL and A. R. SANDAGE: Astronom. J. 61, 97-162 (1956).
  14. PAGE, TH.: Astrophys. Journ. 116, 63 (1952).
  15. ZWICKY, F.: Publ. Astronom. Soc. Pacific 67, 232 (1955).
  16. HERSCHEL, Sir J. F. W.: Results of astronomical observations made during the years 1834 to 1838 at the Cape of Good Hope. Cornhill: Smith, Elder & Co. 1847.
  17. ZWICKY, F.: Helv. phys. Acta 6, 110-127 (1933). Astrophys. Journ. 86, 217 (1937).
  18. HOLMBERG, E.: Medd. Lunds Astr. Observ., Ser. I 1954, No. 186.
  19. BAADE, W., and R. MINKOWSKI: Astrophys. Journ. 119, 206, 215 (1954).
  20. BOLTON, J. G.: Publ. Astronom. Soc. Pacific 68, 477 (1956).
  21. Radio halo around galaxy Messier 87. Sky and Telescope 16, 116 (1957).
  22. SPITZER, L., and W. BAADE: Astrophys. Journ. 113, 413 (1951).
  23. ZWICKY, F.: Proceedings of the Third Berkeley Symposium on Mathematical Statistics and Probability, Vol. III, p.113-143. Berkeley, Cal.: University of California Press 1956.

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