Ks. Chou et Tyh. Wan, ASYMPTOTIC RADIAL SYMMETRY FOR SOLUTIONS OF DELTA-U+E(U)=0 IN A PUNCTURED DISC, Pacific journal of mathematics, 163(2), 1994, pp. 269-295
In this paper a representation formula for solutions of the equation (
) DELTAu + 2Ke(u) = 0, K a constant, in a punctured disc in terms of
multi-valued meromorphic functions is found. As application it is dedu
ced that a necessary and sufficient condition for a solution of (), K
> 0, being asymptotic radially symmetric is integral e(u) < infinity.