Carroll, J. D. (1972) Individual differences andmultidimensionalscaling.In:hepard,R,N,,RomneyOA,K.andNerlove,S.B.(Eds.)Multi-dimensional scaling volume 1 theory. Seminor Press: New York, pp. 105-155.
Davison, M. L. (1983) Multidimensional scaling. JohnWiley & Sons: NewYork,pp. 61-64.