References
- Garner , W. R. 1974 . The Processing of Information and Structure , Potomac , Md. : Lawrence Erlbaum .
- Jacob , R. J.K. 1978 . “Facial Representation of Multivariate Data” . In Graphical Representation of Multivariate Data , Edited by: Wang , P. C.C. 143 – 168 . New York : Academic Press .