B.A. Dubrovin, A.T. Fomenko, S.P. Novikov ; translated by Robert G. Burns ; : us, : gw. -- Springer-Verlag, c1990. -- (Graduate texts in mathematics ; 124 . Modern geometry : methods and applications / B.A. Dubrovin, A.T. Fomenko, S.P. Novikov ; translated by Robert G. Burns ; pt. 3)(Springer series in Soviet mathematics).