Jarmo Hietarinta, Frank Nijhoff, “The eight tetrahedron equations”, Journal of Mathematical Physics, 38, № 7, 1997, 3603
Hendryk Pfeiffer, “2-Groups, trialgebras and their Hopf categories of representations”, Advances in Mathematics, 212, № 1, 2007, 62
Christopher J Schommer-Pries, “Central extensions of smooth 2–groups and a finite-dimensional string 2–group”, Geom. Topol., 15, № 2, 2011, 609
Sjoerd E. Crans, “Generalized Centers of Braided and Sylleptic Monoidal 2-Categories”, Advances in Mathematics, 136, № 2, 1998, 183
Liang Kong, Yin Tian, Shan Zhou, “The center of monoidal 2-categories in 3+1D Dijkgraaf-Witten theory”, Advances in Mathematics, 360, 2020, 106928
Brian Day, Ross Street, “Monoidal Bicategories and Hopf Algebroids”, Advances in Mathematics, 129, № 1, 1997, 99
Zhidong Zhang, Osamu Suzuki, “A Method of the Riemann–Hilbert Problem for Zhang’s Conjecture 2 in a Ferromagnetic 3D Ising Model: Topological Phases”, Mathematics, 9, № 22, 2021, 2936
Louis Crane, Igor B. Frenkel, “Four-dimensional topological quantum field theory, Hopf categories, and the canonical bases”, Journal of Mathematical Physics, 35, № 10, 1994, 5136
R.J. Lawrence, “Algebras and triangle relations”, Journal of Pure and Applied Algebra, 100, № 1-3, 1995, 43
Michiel Hazewinkel, Encyclopaedia of Mathematics, 2000, 249