AdlerO.AdlerR. (1904). Uber das Verhalten gewisser organischer Verbindungen gegenüber Blut mit besonderer Berücksichtigung des Nachweises von Blut. (Quoted by Hepler et al., 1953). HoppeSeyl. Z., 41, 59.
2.
GregersenJ. P. (1916). Occult blood in the stools. J. Amer. med. Ass., 67, 84 (abstr.).
3.
HamT. H. (1950). A syllabus of laboratory examinations in clinical diagnosis. Cambridge, Mass. Harvard University Press, p. 496.
4.
HeplerO. E.WongP.PihlH.D. (1953). Comparison of tests for occult blood in feces. Amer. J. clin. Path., 23, 1263.
5.
MoroneyF. J. (1956). Facts from figures. Harmondsworth. Penguin Books.
6.
NeedhamC.D.SimpsonR.G. (1952). The benzidine test for occult blood in faeces. Quart. J. Med., 45, 123.