Early discussion of 2-groups as Picard 2-groups:
Alexandru Solian, Groupe dans une catégorie, C. R. Acad. Sc. Paris 275 (1972) [ark:/12148/bpt6k57310477/f7]
Alexandru Solian, Coherence in categorical groups, Communications in Algebra 9 10 (1980) 1039-1057 [doi:10.1080/00927878108822631]
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