1. Absence of the cervical spine: Klippel-Feil syndrome;Bauman, G.I.;JAMA
2. Die Schrift: Grundzuge ihrer Physiologie und Pathologie;Eilenmeyer, A.,1879
3. Mirror-writing;Critchley, M.,1928
4. Developmental Diagnosis: Normal and Abnormal Child Development;Gesell, A.; Amatruda, C.S.
5. Obligatory bimanual associated movements;Schott, G.D.; Wyke, M.A.;J Neurol Sci,1977