1. (1) Benno, Y., and T. Mitsuoka. 1991. Effect of diet and aging on human fecal microflora. Bifidobacteria Microflora 10: 89-96.
2. (2) Donaldson, R.M. 1964. Normal bacterial populations of the intestine and their relation to intestinal function. New Engl. J. Med. 270: 938-945.
3. (3) Gorbach, S.L. 1971. Intestinal microflora. Gastroenterology 60: 1110-1129.
4. (4) Mata, L.J., M.L. Mejicsanos, and F. Jimenez. 1972. Studies on the indigenous gastro-intestinal flora of Guatemalan children. Am. J. Clin. Nutr. 25: 1380-1390.
5. (5) Mitsuoka, T., T. Sega, and S. Yamamoto. 1965. Eine verbesserte Methodik der qualitativen and quantitativen Analyse der Darmflora von Menschen und Tieren. Zbl. Bakteriol. Parasit. Infektionkr. Hyg. Abt. I. Orig. A195: 455-469.