4) Calderon R. Myotonic dystrophy: a neglected cause of mental retardation. J Pediatr 1966; 68: 423-31.
5) Roses A D, Harper P S, Bossen E H. Myotonic muscular dystrophy. In: Vinken P J, Bruyn G W, eds. Handbook of clinical neurology. Vol 40. Amsterdam: North-Holland, 1979: 485-532.