Nonvariability among λ Bootis stars E. Paunzen, R. Kuschnig, G. Handler, M. Gelbmann and W. W. Weiss Astron. Astrophys. Suppl. Ser., 124 1 (1997) 23-31 Published online: 15 July 1997 DOI: 10.1051/aas:1997178