1. Two extra X-chromosomes found in a teenage girl;Anderton;Hosp. Tribune,1968
2. A female with the 48, XXXX karyotype;Berkeley;J. Med. Genet.,1970
3. A case of 48, XXXX female with normal intelligence;Blackston;J. Med. Genet.,1972
4. Feeblemindedness and XXXX karyotype;Cagno;J. Mental Deficiency Res.,1968
5. An XXXX chromosome complex in two mentally defective females;Carr;Can. Med. Ass. J.,1961