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Alan Agresti, Considerations in Measuring Partial Association for Ordinal Categorical Data, Journal of the American Statistical Association, Vol. 72, No. 357 (Mar., 1977), pp. 37-45 ...
Robert K. Leik, Causal Models with Nominal and Ordinal Data: Retrospective, Sociological Methodology, Vol. 7 (1976), pp. 271-275 ...