TY - JOUR AU - Harding Smith AU - B. Margon AU - Peter Conti BT - The Astrophysical Journal DA - Jan-01-1973 DO - 10.1086/181132 PY - 1973 EP - L125 T2 - The Astrophysical Journal TI - Spectroscopic Observations of the Cygnus X-1 Optical Candidate UR - http://adsabs.harvard.edu/full/1973ApJ...179L.125S VL - 179 SN - 0004-637X ER -