ELEMENTS OF CRITICAL POINTS THEORY FOR (3+1)-DIMENSIONAL TOPOLOGICAL SOLITONS: STRUCTURE OF TORONS IN THE FADDEEV MODEL Статья Rybakov Yurii P., Sanyuk Valerii I. Nonlinear evolution equations & dynamical systems: NEEDS '94 (Los Alamos, NM). World Sci. Publ., River Edge, NJ. 1995. С. 197-207
EXISTENCE AND CONTINUITY OF AN IMPLICIT FUNCTION IN A NEIGHBORHOOD OF AN ABNORMAL POINT Статья Zhukovskiĭ S.E., Mingaleeva Z.T., Zabreĭko P.P. Вестник Московского университета. Серия 15: Вычислительная математика и кибернетика.