1. The rate of progress of food residues through the bowel;Alvarez, W.C.; Freedlander, B.L.;J. Amer. med. Ass,1924
2. Gastro-intestinal blood loss measured by radioactive chromium;Cameron, A.D.;Gut,1960
3. The value of selective drugs in the treatment of constipation;Mulinos, M.G.;Rev. Gastroent,1935
4. Study of urinary and fecal excretion of radioactive chromium Crl in man. Its use in the measurement of intestinal blood loss associated with hookworm infection;Roche, M.; Perez-Gimenez, M.E.; Layrisse, M.; Di Prisco, E.;J. clin. Invest,1957
5. Experience with the chromic oxide method of fecal marking in metabolic balance investigations on humans;Whitby, L.G.; Lang, D.;Ibid,1960