Valchev, T.I., “On the quadratic bundles related to Hermitian symmetric spaces”, Journal of Geometry and Symmetry in Physics, 29 (2013), 83–110
Yanovski, A., “Recursion Operators and expansions over adjoint solutions for the Caudrey–Beals–Coifman system with ZP reductions of Mikhailov type”, Journal of Geometry and Symmetry in Physics, 30 (2013), 105–120
Alexandar B. Yanovski, Gaetano Vilasi, “Geometric Theory of the Recursion Operators for the Generalized Zakharov–Shabat System in Pole Gauge on the Algebra $\mathrm{sl}(n,\mathbb C)$ with and without Reductions”, SIGMA, 8 (2012), 087, 23 pp.
Grahovski G.G., “The Generalised Zakharov-Shabat System and the Gauge Group Action”, J. Math. Phys., 53:7 (2012), 073512
Gerdjikov, V., Grahovski, G., Mikhailov, A., Valchev, T., “On soliton interactions for the hierarchy of a generalised Heisenberg ferromagnetic model on Su(3)/S(U(1)+U(2)) symmetric space”, Journal of Geometry and Symmetry in Physics, 25 (2012), 23–55
Yanovski, A.B., “Geometry of the recursion operators for Caudrey-Beals-Coifman system in the presence of Mikhailov type ?p reductions”, Journal of Geometry and Symmetry in Physics, 25 (2012), 77–97