COMPTEL upper limits for the $^56$Co $γ$-rays from SN1998bu
Proceedings article published in 2000 by
R. Georgii,
S. Plüschke,
R. Diehl 
,
W. Collmar,
G.~G Lichti,
Schönfelder,
H. Bloemen,
J. Knödlseder,
M. McConnell,
J. Ryan,
K. Bennett
,
W. Collmar,
G.~G Lichti,
Schönfelder,
H. Bloemen,
J. Knödlseder,
M. McConnell,
J. Ryan,
K. Bennett
