Quasigraded Lie algebras and modified Toda field equations. Skrypnyk, Taras V. — 2006 SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]

Classical $R$-operators and integrable generalizations of Thirring equations. Skrypnyk, Taras V. — 2008 SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]