Abp. Vankuilenburg et al., CIRCADIAN VARIATION OF DIHYDROPYRIMIDINE DEHYDROGENASE (DPD), URIDINEPHOSPHORYLASE (UP), BETA-ALANINE (BETA-ALA) AND 5-FLUOROURACIL, (5-FU) DURING CONTINOUS INFUSION (CI) FLUOROPYRIMIDINES (FP), European journal of cancer, 31A, 1995, pp. 954-954