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Volumes 3 and 4 contain papers contributed by participants of the International Seminar
"Towards 100 years after Sophus Lie"
held in Kazan, September 7–17, 1998, which was organized by International Sophus Lie Center and by Kazan University.

	On the variety of 3-dimensional Lie algebras Y. Agaoka		5
	Сlassification of homogeneous submanifolds in homogeneous spaces B. M. Doubrov, B. P. Komrakov		19
	Equivalence of holonomic differential equations B. M. Doubrov, B. P. Komrakov, T. Morimoto		39
	On some generalisations of constant mean curvature surfaces A. Fujioka, J. Inoguchi		73
	Intermediate inversion formulas in integral geometry M. M. Graev		97
	Developable hypersurfaces and homogeneous spaces in a real projective space G. Ishikawa		113
	Cohomological approach to poisson structures on nonlinear evolution equations I. S. Krasil'shchik		127
	Graded nilpotent lie algebras in low dimensions O. Kuzmich		147
	On decomposable Monge–Ampère equations Y. Machida, T. Morimoto		185
	The Lie derivative and cohomology of $G$-structures M. A. Malakhaltsev		197
	Nnambu–Poisson structures and their foliations K. Mikami		201
	Hypersurface geometry and hamiltonian systems of hydrodynamic type R. Miyaoka		209
	Representations of pseudo-unitary groups associated with a cone V. F. Molchanov		221