1. Colucci G, Maiello E, Brandi M. La chemioterapia sistemica del carcinoma colorettale in fase avanzata. In: Colucci G and Prete F eds «Il carcinoma del colon-retto». Bari: Cacucci, 1989: 287–324.
2. Benz C, Cadman E. Modulation of fluorouracil metabolism and cytotoxicity by antimetabolite pretreatment in human colorectal adenocarcinoma. Cancer Res. 1981; 41: 994–8.
3. Bertino JR, Sawicki LW, Lindquist CA. Schedule-dependent antitumor effects of methotrexate and 5-fluorouracil. Cancer Res 1977; 37: 327–8.
4. Lee VT, Khwaja TA. Adjuvant post-operative chemotherapy with 5-fluorouracil and methotrexate: effect of schedule of administration on metastasis of 13762 mammary adenocarcinoma. J Surg Oncol 1977; 9: 469–79.
5. Fernandes DJ, Moroson BA, Bertino JR. The role of methotrexate and dihydrofolate polyglutamates in the enhancement of fluorouracil action by methotrexate. Cancer Treat Rep 1981; 65 (1): 29–35.