[1] S. Banach, Theorie des Operations Lineaires, Monografje Matematyczne, TOM I, 1932.
[2] C. Berge, Graphs et Hypergraphs, Dunod, Paris, 1970.
[3] C. Berge, Hypergraphs, Elsevier Science Publishers B.V., 1989.
[4] P. Corsini and V. Leoreanu, Applications of Hyperstructures Theory, Advances in Mathematics, Kluwer Academic Publishers, 2003.
[5] P. Corsini, Prolegomena of Hypergroup Theory, Aviani editor, Second edition, 1993.
[6] P. Corsini, Hypergraphs and hypergroups, Algebra Univer. 35 (1996), 548–555.
[7] B. Davvaz and T. Vougiouklis, A Walk Through Weak Hyperstructures: Hv-Structure, World Scientific Publishing Co. Pte. Ltd., Hackensack, NJ, 2019.
[8] B. Davvaz and V. Leoreanu-Fotea, Hyperring Theory and Applications, International Academic Press, USA, 2007.
[9] B. Davvaz, Polygroup theory and related systems, World Scientific Publishing Co. Pte. Ltd., Hackensack, NJ, 2013.
[10] M. Farshi, B. Davvaz, and S. Mirvakili, Degree hypergroupoids associated with hypergraphs, Filomat 28 (2014), 119–129.
[11] M. Farshi, B. Davvaz, and S. Mirvakili, Hypergraphs and hypergroups based on a special relation, Commun. Algebra 42 (2014), 3395–3406.
[12] I.M. Gelfand, Normierte ringe, Rec. Math. (Mat. Sbornik) 51 (1941), 3–24.
[13] F. Marty, Sur une generalization de la notion de group, 8th Cong. Math. Scand., 1934, pp. 45–49.
[14] S. Mirvakili and R. Manaviyat, r-hypergroupoids associated with metric spaces, 3rd Seminar Harmonic Anal. Appl., University of Yazd, Iran, 2015, pp. 46.
[15] F. Hausdorff, Punktmengen in allgemeinen raumen, grundzage der mengenlehre, Goschens Lehrbucherei/Gruppe I, Reine und Angewandte Mathematik Series, Leipzig: Von Veit, 2011, pp. 211. [In German]
[16] J. Von Neumann, Einige satze uber messbare abbildungen, Ann. Math. 33 (1932), no. 3, 574–586.
[17] W. Rudin, Principles of Mathematical Analysis, McGraw-Hill, New York, 1976.
[18] M.A. Zarei and S. Mirvakili, Hypergroupoids associated with a metric space, 52nd Ann. Iran. Math. Conf., Shahid Bahonar University of Kerman, Iran, 2021, pp. 673–676.