Rotation Periods and Lightcurves of 1858 Lobachevskij, 2384 Schulhof and (5515) 1989 EL1 Ditteon, R. ; Bixby, A. R. ; Sarros, A. M. ; Waters, C. T. Abstract Publication: Minor Planet Bulletin Pub Date: December 2002 Bibcode: 2002MPBu...29...69D