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Multidimensional scaling
Kruskal, Joseph B., (1978)
Introduction to multidimensional scaling : theory, methods, and applications
Schiffman, Susan S., (1981)
Toward a practical method which helps uncover the structure of a set of multivariate observations by finding the linear transformation which optimizes a new ʺindex of condensationʺ
Kruskal, Joseph B., (1969)