Further Observations of Extremely Cool Stars Ulrich, B. T. ; Neugebauer, G. ; McCammon, D. ; Leighton, R. B. ; Hughes, E. E. ; Becklin, E. Abstract Publication: The Astrophysical Journal Pub Date: October 1966 DOI: 10.1086/148881 Bibcode: 1966ApJ...146..288U