VEGA-1 Neutral Gas Measurements Near Comet Halley - Preliminary Results Keppler, E. ; Afonin, V. V. ; Curtis, C. C. ; Dyachkov, A. V. ; Ero, J. ; Fan, C. Y. ; Hsieh, K. C. ; Hunten, D. M. ; Ip, W. H. ; Richter, A. K. ; Somogyi, A. J. ; Umlauft, G. Abstract Publication: Soviet Astronomy Letters Pub Date: August 1986 Bibcode: 1986SvAL...12..274K