共 45 条
- [2] CANNON AJ, 1921, 224 HARV CIRC
- [3] CEDERBLAD S, 1946, LUND MEDD 2
- [7] FRANTSMAN YL, 1962, SOV ASTRON, V6, P198
- [8] Gum C.S., 1955, MMRAS, V67, P155
- [9] HARO G, 1952, B OBS TONANTZINTLA T, P93
- [10] 7 NEW PLANETARY NEBULAE [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1961, 73 (431) : 159 - 162