298 citations · 1.5k across the 41 of their papers we have counts for
1 paper · 2 filters
S. Sembay, R. Edelson, A. Markowitz +2
The bright blazar Mkn 421 has been observed four times for uninterrupted durations of ~ 9 - 13 hr during the performance verification and calibration phases of the XMM-Newton missi…