1. Lactase deficiency in the adult. A common occurrence;Cuatrecasas, P.; Lockwood, D.H.; Caldwell, JR;Lancet,1965
2. A radical difference in incidence of lactase deficiency. A survey of milk intolerance and lactase deficiency in healthy adult males;Bayless, T.M.; Rosensweig, N.S.;TAMA; Did malaria selectfor primary adult lactase deficiency,1966
3. Recessive inheritance of adult-type lactose malabsorption;Sahi, T.; Isokoski, M.; Jussila, J.; Launiala, K.; Pyorala, K.;Lancet,1973
4. The inheritance of selective adult-type lactose malabsorption;Sahi, T.;Scand _J Gastroenterol,1974
5. Genetics of lactose digestion in humans;Flatz, G.;Adv Hum Genet,1987