A process for the polymerization of olefinic hydrocarbons is carried out in the presence of a catalyst comprising a catalyst component derived from reacting a compound of the formula Me.sup.1 R.sup.1.sub.n X.sup.1.sub.4-n, a compound of the formula Me.sup.2 R.sup.2.sub.m X.sup.2.sub.z-m, an ...http://www.google.fr/patents/US5677401?utm_source=gb-gplus-shareBrevet US5677401 - Catalyst components for polymerization of olefins
