The Nature of the Dynamo at the End of the Main Sequence: A ROSAT Survey of the Late M Dwarfs Fleming, T. A. ; Giampapa, M. S. ; Schmitt, J. H. M. M. ; Bookbinder, J. A. Abstract Publication: Cool Stars, Stellar Systems, and the Sun Pub Date: 1992 Bibcode: 1992ASPC...26...93F