Generalized Associativity on Grupoids Aleksandar Krapež (1980) Publications de l'Institut Mathématique
Global actions, groupoid atlases and applications. Bak, A., Brown, R., Minian, G., Porter, T. (2006) Journal of Homotopy and Related Structures
Graphs and associative triples in quasitrivial groupoids Tomáš Kepka, Jan Kratochvíl (1984) Commentationes Mathematicae Universitatis Carolinae
Graphs and quasitrivial groupoids Milan Vítek (1986) Acta Universitatis Carolinae. Mathematica et Physica
Groupoids and crossed objects in algebraic topology. Brown, Ronald (1999) Homology, Homotopy and Applications
Groupoids and the Brauer group M.-A. Moens, E. M. Vitale (2000) Cahiers de Topologie et Géométrie Différentielle Catégoriques
Groupoids, stability cokernel sequences and duality Philip R. Heath, Klaus Heiner Kamps (1981) Cahiers de Topologie et Géométrie Différentielle Catégoriques
Groupoids, the Phragmen-Brouwer property, and the Jordan curve theorem. Brown, Ronald (2006) Journal of Homotopy and Related Structures
Groupoids with non-associative triples on the diagonal Aleš Drápal (1985) Czechoslovak Mathematical Journal
Gruppoide und boolesche Strukturen Barbara Schultz (1984) Beiträge zur Algebra und Geometrie = Contributions to algebra and geometry