Remarks on duality for Σ-groups. I. Products and coproducts
Cahiers de Topologie et Géométrie Différentielle Catégoriques, Volume 30 (1989) no. 1, p. 45-59
@article{CTGDC_1989__30_1_45_0,
     author = {Higgs, Denis},
     title = {Remarks on duality for $\Sigma $-groups. I. Products and coproducts},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {30},
     number = {1},
     year = {1989},
     pages = {45-59},
     zbl = {0683.20044},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1989__30_1_45_0}
}
Higgs, Denis. Remarks on duality for $\Sigma $-groups. I. Products and coproducts. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Volume 30 (1989) no. 1, pp. 45-59. http://www.numdam.org/item/CTGDC_1989__30_1_45_0/

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