MATHEMATISCHE ANNALEN, cilt.328, sa.3, ss.503-523, 2004 (SCI-Expanded)
Some ball-quotient orbifolds are related by covering maps. We exploit these coverings to find infinitely many orbifolds on P-2 uniformized by the complex 2-ball B-2 and some orbifolds over K3 surfaces uniformized by B-2. We also give, along with infinitely many reducible examples, an infinite series of irreducible curves along which P-2 is uniformized by the product of 1-balls B-1 x B-1.