Ne. Mavromatos et E. Winstanley, EXISTENCE THEOREMS FOR HAIRY BLACK-HOLES IN SU(N) EINSTEIN-YANG-MILLSTHEORIES, Journal of mathematical physics, 39(9), 1998, pp. 4849-4873
We establish the existence of hairy black holes in su(N) Einstein-Yang
-Mills theories, described by N-1 parameters, corresponding to the nod
es of the gauge field functions. (C) 1998 American Institute of Physic
s.