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We prove Manin's conjecture for two del Pezzo surfaces of degree four whichare split over Q and whose singularity types are respectively 3A_1 and A_1+A_2.For this, we study a certain restricted divisor function and use a result aboutthe equidistribution of its values in arithmetic progressions. In this task,Weil's bound for Kloosterman sums plays a key role.

Manin's conjecture for two quartic del Pezzo surfaces with 3A_1 and A_1+A_2 singularity types