Bender, DA; Magboul, BI; Wynick, D; (1982) Probable mechanisms of regulation of the utilization of dietary tryptophan, nicotinamide and nicotinic acid as precursors of nicotinamide nucleotides in the rat. British Journal of Nutrition , 48 (1) 119 - 27. 10.1079/BJN19820094. Green open access