A 15 years monitoring program at 408 MHz M. Bondi, L. Padrielli, R. Fanti, A. Ficarra, L. Gregorini and F. Mantovani Astron. Astrophys. Suppl. Ser., 120 1 (1996) 89-98 Published online: 15 November 1996 DOI: 10.1051/aas:1996276