GÜRSEY'S CHIRAL MODEL AND ITS MODIFICATIONS Article Sanyuk Valerii I. Strings and symmetries (Istanbul, 1994). Springer, Berlin. 1995. P. 326-331
SOME NEW INTEGRABLE SYSTEMS WITH EXACT SOLUTIONS OF THE PATTERN-SOLITON TYPE Article Makhankov V.G., Sanyuk V.I. Nonlinear evolution equations & dynamical systems: NEEDS '94 (Los Alamos, NM). World Sci. Publ., River Edge, NJ. 1995. P. 129-142