1. Partial tetrasomy 9 (9pter-9q2101) due to an extra iso-dicentric chromosome;Abe;Ann Genet,1977
2. Tetrasomy 9p caused by idic (9) (pter → q13 → pter);Cavalcanti;Am J Med Genet,1987
3. Isochromosomes 12 p and 9p: parental origin and possible mechanisms of formation;Dutly;Eur J Hum Genet,1998
4. Trisomy 9p and tetrasomy 9p: a unique, clinically recognisable syndrome;Fryns;Genet Couns,1998
5. Tetrasomy 9p: clinical aspects and enzymatic gene dosage expression;Garcia-Cruz;Ann Genet,1982