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 Almost distributive varieties of Lie ringsD. S. Ananichev 3 Examples of trigonometric series with non-negative partial sumsA. S. Belov 21 Homogenization of a mixed boundary-value problem for the Laplace operator in the case of an insoluble 'limit' problemA. G. Belyaev, G. A. Chechkin 47 Non-splittable extensions of a general Lie algebra of Cartan type $W_2(\overline m)$A. S. Dzhumadil'daev, U. U. Umirbaev 61 On rational approximations of values of a certain class of entire functionsW. V. Zudilin 89 Asymptotic behaviour of the fundamental solution of a second-order parabolic equationE. F. Lelikova 125 Bifurcations of limit cycles of differential equations admitting an involutive symmetryE. V. Nikolaev 143