Reference
O. Wyler, Weakly exact categories. Arch. Math.17, 9–19 (1966).
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Wyler, O. A remark about connecting morphisms. Arch. Math 18, 223–225 (1967). https://doi.org/10.1007/BF01900625
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DOI: https://doi.org/10.1007/BF01900625