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Strengthening self-restraint and self-purification is a common challenge faced by all political parties in the world and the CPC's resolve to strengthen party building is admirable, said heads of the three parties. The CPC's practice is good reference for other political parties in the world, they said.

Party authorities should increase their contact with intellectuals in colleges, befriend them and sincerely listen to their opinions, Xi said.

Female delegates and ethnic minorities should account for a certain proportion of the total, the statement said.

The Croatian prime minister also welcomed Chinese companies to take part in Croatia's infrastructure construction.

The premier pointed to small and medium-sized enterprises (SMEs) and innovation in particular as the areas where the two countries should step up efforts to promote their future cooperation.