Geodesic
Survey of generalized pregroups and a~question of Reinhold Baer
Algebra and discrete mathematics, Tome 13 (2012) no. 2, pp. 220-236

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There has been recent interest in Stallings' Pregroups. (See [2] and [12].) This paper gives a survey of generalized pregroups. We also answer a question of Reinhold Baer [1] on pregroups and answer a generalization of this question for generalized pregroups.
Keywords: Pregroups, Kushner Axiom K. small cancellation. 
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Anthony M. Gaglione; Seymour Lipschutz; Dennis Spellman. Survey of generalized pregroups and a~question of Reinhold Baer. Algebra and discrete mathematics, Tome 13 (2012) no. 2, pp. 220-236. http://geodesic.mathdoc.fr/item/ADM_2012_13_2_a5/