1. Iraq. The Universal Jewish Encyclopedia;Alpert;N.Y.,1941
2. Pseudocholinesterase variants in Thailand and Japan;Altland;Humangenetik,1967
3. Absence of variants of usual serum pseudocholinesterase (Acylcholine Acylhydrolase) in South American Indians;Arends;Acta genet. (Basel),1967
4. Serum pseudocholinesterase levels and variants in the people of Papua and New Guinea;Curtain;Amer. J. trop. Med. Hyg.,1965
5. Dubnov , S. 1933 History of the Eternal People.