Fluorouracil (FU) plus I-leucovorin (I–LV) versus observation after potentially curative resection of liver or lung metastases from colorectal cancer (CRC): results of the ENG (EORTC / NCIC CTG / GIVIO) randomized trial. - Langer,B.; Bleiberg,H.; Labianca,R. (Proc Am Soc Clin Oncol, 2002)