@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}, volume = {30}, year = {1989}, pages = {45-59}, zbl = {0683.20044}, language = {en}, url = {http://dml.mathdoc.fr/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, Tome 30 (1989) pp. 45-59. http://gdmltest.u-ga.fr/item/CTGDC_1989__30_1_45_0/
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