Such catalyst systems give both high productivity and low solubles in {HEAD ~ the polymerization} of {TAIL ~ propylene} 
of
Such catalyst systems give both high productivity and low solubles in { HEAD ~ the polymerization } of { TAIL ~ propylene }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL