15.01.2004
A randomized trial of letrozole in postmenopausal women after five years of tamoxifen therapy for early-stage breast cancer
P.E. Goss, J.N. Ingle, S. Martino, N.J. Robert, H.B. Muss, M.J. Piccart, M. Castiglione, D. Tu, L.E. Shepherd, K.I. Pritchard, R.B. Livingston, N.E. Davidson, L. Norton, E.A. Perez, J.S. Abrams, P. Therasse, M.J. Palmer, J.L. Pater
The New England Journal of Medicine, 2003; 349: 1793-1802