1. Arch;ARMIALY, M.F.;Ophthal. (Chicago); Trans,1967
2. Ovalness of the optic cup and;SAYEGH, R.E.;disc,1969
3. Amer;BECKER, B.;J. Ophthal; Acta ophthal,1970
4. Trans;KIRSCH, R.E.; ANDERSON, D.R.;Ophthal,1973
5. Non-parametric Statistics for Behavioural Scientists;SIEGEL, S.,1956