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VLA observations at 7 mm of the planetary nebula ic 4997
VLA observations planetary nebula 7 mm
2009/6/11
VLA observations at 7 mm of the planetary nebula ic 4997。
Study of spectral variability of the planetary nebula ic 4997 over 25 years (1972-1996)
planetary nebula spectral variability ic 4997
2009/6/11
Study of spectral variability of the planetary nebula ic 4997 over 25 years (1972-1996)。