Extension structures are defined by Guitart in a short note called Extenseurs, cf. (Guitart, 1980). (TODO: translate it).
Bibliography
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Guitart, R. (1980). Extenseurs. Diagrammes, 3. http://www.numdam.org/item/DIA_1980__3__A3_0/Details
Extension structures are defined by Guitart in a short note called Extenseurs, cf. (Guitart, 1980). (TODO: translate it).