B.A. Dubrovin, A.T. Fomenko, S.P. Novikov ; translated by Robert G. Burns ; : U.S, : Germany. -- 2nd ed. -- Springer-Verlag, c1992. -- (Graduate texts in mathematics ; 93 . { Modern geometry : methods and applications / B.A. Dubrovin, A.T. Fomenko, S.P. Novikov ; translated by Robert G. Burns } ; pt. 1)(Springer series in Soviet mathematics).