B.A. Dubrovin, A.T. Fomenko, S.P. Novikov ; translated by Robert G. Burns ; : us, : gw. -- Springer-Verlag, c1985. -- (Graduate texts in mathematics ; 104 . { Modern geometry : methods and applications / B.A. Dubrovin, A.T. Fomenko, S.P. Novikov ; translated by Robert G. Burns } ; pt. 2)(Springer series in Soviet mathematics).