1. Waisel, Y., and Cohen, S.: Poison plants in Israel. Petach Tikvah, Ministry of Environmental Ecology in Israel, 1977, p. 32.
2. Augenschadigungen durch den saft der Euphorbia peplus;Hartmann;Klin. Monatsbl. Augenheilkd.,1940
3. Klinische Beobachtung und tierexperimentalle undersuchungen uber die Wirkung von saft der Euphorbia lathyris (Springwolfsmilch) am;Geidel;Klin. Monatsbl. Augenheilkd.,1962
4. Keratoconjunctivitis resulting from the sap of candelabra cactus and the pencil tree;Crowder;Arch. Ophthalmol.,1964
5. On the active principles of the spurge family (Euphorbiaceae). The skin irritant and tumor promoting diterpene esters of Euphorbia tirucalli L originating from South Africa;Furstenberger;Z. Naturforsch. [C],1985