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  1.  13
    Implication in Equational Logic.H. G. Forder & J. A. Kalman - 1971 - Journal of Symbolic Logic 36 (1):162-162.
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    The anatomy of demonstration.H. G. Forder - 1937 - Australasian Journal of Psychology and Philosophy 15 (2):81-97.
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  3.  13
    The anatomy of demonstration.H. G. Forder - 1937 - Australasian Journal of Philosophy 15 (2):81 – 97.
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