MAGNETIC EXCITATIONS AND THE COOPERATIVE JAHN-TELLER TRANSITION IN PrCu2 J.K. Kjems, H.R. Ott, S.M. Shapiro and K. Andres J. Phys. Colloques, 39 C6 (1978) C6-1010-C6-1012 DOI: 10.1051/jphyscol:19786446