Effective resolvent applied to interacting resonances F. X. Gadéa, Ph. Durand, T. González-Lezana, G. Delgado-Barrio and P. Villarreal Eur. Phys. J. D, 15 2 (2001) 215-219 Published online: 15 August 2001 DOI: 10.1007/s100530170168