1. Arnhold, R. G., Perman, J. A., and Nurse, G. T., 1981, Persistent high intestinal lactase activity in Papua New Guinea: The breath hydrogen test in a Sepik population, Ann. Hum. Biol. 8: 481–484.
2. Arnold, J., Diop, M., Kodjovi, M., and Rozier, J., 1980, L’intolérance au lactose chez l’adulte au Sénégal, C. R. Soc. Biol. 174: 983–992.
3. Arola, H., Koivula, T., Jokela, H., and Isokoski, M., 1982, Simple urinary test for lactose malabsorption, Lancet 2: 524–525.
4. Barr, R. G., 1981, Limitations of the hydrogen breath test and other techniques for predicting incomplete lactose absorption, in: Lactose Digestion: Clinical and Nutritional Implications ( D. M. Paige and T. M. Bayless, eds.), Johns Hopkins University Press, Baltimore, pp. 110–114.
5. Barr, R. G., Watkins, J. B., and Perman, J. A., 1981, Mucosal function and breath hydrogen excretion: Comparative studies in the clinical evaluation of children with nonspecific abdominal complaints, Pediatrics 68: 526–533.