1. Confinement of quarks
2. Hamiltonian formulation of Wilson's lattice gauge theories
3. Y. Makeenko, Methods in Contemporary Gauge Theory (Cambridge University Press 2005).
4. Discrete nonlocal waves
5. C. S. Acatrinei, in Mahematical Methods and Computational Science, edited by Gh. Adam, Ján Buša, M. Hnatič (Springer 2012), p. 122.