Angle-resolved spectroscopy of electron-electron scattering in a 2D system A. V. Yanovsky, H. Predel, H. Buhmann, R. N. Gurzhi, A. N. Kalinenko, A. I. Kopeliovich and L. W. Molenkamp Europhys. Lett., 56 5 (2001) 709-715 Published online: 01 December 2003 DOI: 10.1209/epl/i2001-00578-y