1. Further investigations on the fractionation and purification of the toxic components from the venom of the Bulgarian viper (Vipera ammodytes ammodytes);Alexiev;Z. physiol. Chem.,1971
2. The estimation of pepsin, trypsin, papain and cathepsin with hemoglobin;Anson;J. gen. Physiol.,1939
3. Sur la variation cyclique annuelle de toxicité du sang de la vipère;Bertrand;Annls Inst. Pasteur, Paris,1942
4. Chemistry and biochemistry of the snake venoms of Europe and the Mediterranean regions;Boquet,1968
5. Isolation of Vipera palestinae hemorrhagin and distinction between its hemorrhagic and proteolytic activities;Grotto;Biochim. biophys. Acta,1967