- E. A. Elrifai, “Torus Knots and Links from Eikonal Equations and Knot Invariants for Classification of Atoms”, Int J Theor Phys, 47, № 3, 2008, 850
- Ludvig Faddeev, Antti J. Niemi, “Spin-charge separation, conformal covariance and the Yang–Mills theory”, Nuclear Physics B, 776, № 1-2, 2007, 38
- Pierre van Baal, “Viewpoints on abelian projections”, Nuclear Physics B - Proceedings Supplements, 109, № 1, 2002, 109
- Fanghua Lin, Yisong Yang, “Static knot energy, Hopf charge, and universal growth law”, Nuclear Physics B, 747, № 3, 2006, 455
- Juha Jäykkä, Jarmo Hietarinta, Petri Salo, “Topologically nontrivial configurations associated with Hopf charges investigated in the two-component Ginzburg-Landau model”, Phys. Rev. B, 77, № 9, 2008, 094509
- L. Dittmann, T. Heinzl, A. Wipf, Confinement, Topology, and Other Non-Perturbative Aspects of QCD, 2002, 83
- David Seč, Simon Čopar, Slobodan Žumer, “Topological zoo of free-standing knots in confined chiral nematic fluids”, Nat Commun, 5, № 1, 2014, 3057
- Amy Thompson, Alexander Wickes, Joe Swearngin, Dirk Bouwmeester, “Classification of electromagnetic and gravitational hopfions by algebraic type”, J. Phys. A: Math. Theor., 48, № 20, 2015, 205202
- Minoru Hirayama, Chang-Guang Shi, “Class of exact solutions of the Faddeev model”, Phys. Rev. D, 69, № 4, 2004, 045001
- Mauri Miettinen, Antti J. Niemi, Yuri Stroganov, “Aspects of duality and confining strings”, Physics Letters B, 474, № 3-4, 2000, 303