Star formation in the merging galaxy cluster Abell 3921
  Through a combined optical and radio analysis, we have investigated the possible connection between the dynamical state of the merging cluster A3921 and its star formation properties, reaching the conclusion that the on-going merger is triggering a SF episode in the collision region. 
C. Ferrari, S. Maurogordato, L. Feretti, R.W. Hunstead, C. Benoist, A.   Cappi, S. Schindler, E. Slezak