1. Balotin, N. M., andJ. R. di Palma: Spontaneous electrical activity ofDionaea muscipula. Science138, 1338–1339 (1962).
2. Clautriau, G.: La digestion dans les urnes deNepenthes. Mém. Couronnés et autres Mém. Acad. roy. Belg. Cl. Sci.59, 1–55 (1900).
3. Goebel, K.: Pflanzenbiologische Schilderungen. Teil 2. Marburg: Elwert 1891/93.
4. Greenberg, D. M.: Plant proteolytic enzymes. In:S. P. Colowick andN. O. Kaplan, Methods in enzymology II. New York: Academic Press 1955.
5. Hepburn, J. S.: Biochemical studies of the pitcher liquor ofNepenthes. Proc. Amer. phil. Soc.57, 112–129 (1918).