Double Blind randomised trial of very-low-dose warfarin for prevention of thromboembolism in state IV breast cancer - Levine, M; Hirsh, J; Gent, M; Arnold, A; Warr, D; Falanga, A; Samosh, M; Bramwell, V; Pritchard, K I; Stewart, D; Goodwin, P (Lancet, 1994)