1. P.S. Aleksandrov, Combinatorial Topology, OGIZ, Moscow, 1947 (in Russian); P.S. Aleksandrov, Combinatorial Topology, vol. 1, Graylock Press, Albany, NY, 1956 (in English).
2. Nonsymmetric approximations in the spaces of summable functions;Babenko;Ukrainian Math. J.,1982
3. Inequalities for rearrangements of differentiable periodic functions;Babenko;problems of approximation and integrating, Dokl. USSR,1983
4. V.F. Babenko, On a certain problem of optimization of the approximate integration, Studies on Modern Problems of Summation and Approximation of Functions and their Applications, Dnepropetrovsk University, Dnepropetrovsk, 1984, pp. 3–13 (in Russian).
5. widths and optimal quadrature formulae for classes of periodic functions with rearrangement invariant sets of derivatives;Babenko;Anal. Math.,1987