Energy resolution of alpha particles in a microbulk Micromegas detector at high pressure argon and xenon mixtures - Dafni, T.; Ferrer-Ribas, E.; Giomataris, I.; Gorodetzky, Ph.; Iguaz, F.; Irastorza, I.G.; Salin, P.; Tomás, A. (Nuclear Instruments & Methods in Physics Research Section A, 2009)