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    Hector-Neri Castañeda. Imperative reasonings. Philosophy and phenomenological research, vol. 21 no. 1 (1960), pp. 21–49. - B. A. O. Williams. Imperative inference. I. Analysis (Oxford), vol. 23 suppl. (1963), pp. 30–36. - P. T. Geach. Imperative inference. II. Analysis (Oxford), vol. 23 suppl. (1963), pp. 37–42. - Nicholas Rescher and John Robison. Can one infer commands from commands?Analysis (Oxford), vol. 24 no. 5 (1964), pp. 176–179. - André Gombay. Imperative inference and disjunction. Anal | NobleID