Torgerson, W. S.Theory and methods of scaling . New York: Wiley, 1960.
2.
Kruskal, J. B. and F. J. Carmone, How to use M-D-SCAL and other useful information . Murray Hill, N. J.: Bell Telephone Laboratories, March, 1969 (mimeo).
3.
Young, F. W. and Torgerson, W. S.TORSCA, a Fortran IV program for Shepard-Kruskal multidimensional scaling analysis. Behavioral Science, 1967 , 12, 498.