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4. Bird headed dwarfs (Seckel's syndrome);Harper, R.G.; Orti, E.; Baker, R.K.;J Pediatr,1967
5. Familial bird-headed dwarfism (Seckel's syndrome);Sauk, J.J.; Litt, R.; Espiritu, C.E.; Delaney, I.R.;J Med Genet,1973