Design of a Lightweight Stablilized Balloon Gondola for X-ray Observations Nystrom, G. ; Cheimets, P. ; Covault, C. ; Grindlay, J. ; Coyle, L. ; Licata, F. ; Kuosmanen, V. Abstract Publication: SAO Special Report Pub Date: 1992 Bibcode: 1992SAOSR........1N