Elements of categorical reasoning: Products and coproducts and some other (co-)limits

Poigné, A. (1986). Elements of categorical reasoning: Products and coproducts and some other (co-)limits. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 240 LNCS, pp. 16–42). Springer Verlag. https://doi.org/10.1007/3-540-17162-2_114