Studies on riboflavin tetra nicotinate metab ii some physiological and pharmacological tests mouse rat Kotaki, A.; Kato, K.; Okumura, M.; Sakurai, T.; Yagi, K. Journal of Vitaminology 14(3): 253-269 1968 0022-5398 https://eurekamag.com/research/025/567/025567068.php