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 On commutativity of connected groupsS. A. Bogatyi, O. D. Frolkina 3 Poincaré biextension and idèles on an algebraic curveS. O. Gorchinskiy 25 Geometry of operator cross ratioM. I. Zelikin 39 Asymptotic behaviour of a special solution of Abel's equation relating to a cusp catastropheA. M. Il'in, B. I. Suleimanov 55 Kolmogorov and trigonometric widths of the Besov classes $B^r_{p,\theta}$ of multivariate periodic functionsA. S. Romanyuk 71 Embedding lattice actions in flows with multidimensional timeS. V. Tikhonov 97 On the rationality of non-singular threefolds with a pencil of Del Pezzo surfaces of degree 4K. A. Shramov 133