COMPTEL upper limits for the Co γ-ray emission from SN1998buR. Georgii, S. Plüschke, R. Diehl, G. G. Lichti, V. Schönfelder, H. Bloemen, W. Hermsen, J. Ryan and K. BennettA&A, 394 2 (2002) 517-523DOI: https://doi.org/10.1051/0004-6361:20021133