GRS1758-258: RXTE Monitoring of a Rare Persistent Hard State Black Hole Obst, M. ; Pottschmidt, K. ; Lohfink, A. ; Wilms, J. ; Böck, M. ; Smith, D. M. ; Tomsick, J. A. ; Kreykenbohm, I. Abstract Publication: Acta Polytechnica Pub Date: 2011 Bibcode: 2011AcPol..51f..49O