TWO PARTICLE VERSUS THREE PARTICLE CONTRIBUTIONS TO A DYNAMICAL CORRELATION FUNCTION IN LIQUIDS R. Brinkmann, M. Elwenspoek, P. Maxim, C.A. Paulick and D. Quitmann J. Phys. Colloques, 46 C9 (1985) C9-135-C9-139 DOI: 10.1051/jphyscol:1985917