SIO Masers in the Star Forming Regions W:51 IRS:2 and SAGITTARIUS-B2 MD:5 Ukita, N. ; Hasegawa, T. ; Kaifu, N. ; Morita, K. I. ; Okumura, S. ; Suzuki, H. ; Ohishi, M. ; Hayashi, M. Abstract Publication: Star Forming Regions Pub Date: 1987 Bibcode: 1987IAUS..115..178U