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              NISHISATO, S., 1980: Analysis of Categorical Data: Dual Scaling and its Applications. Toronto: University of Toronto Press.
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              Nishisato, S. (1980), Analysis of Categorical Data: Dual Scaling and its Applications. Toronto: University of Toronto Press. SAS 1985; User's Guide: Statistics. Gary, N.C.: SAS Institute Inc.
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              Nishisato, S. (1980). Analysis of Categorical Data: Dual Scaling and its Applications. Toronto, Canada: University of Toronto Press.
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