Method for indoor localization of mobile devices based on AoA and Kalman filtering -- Cross-Validated Sequentially Constructed Multiple Regression -- How to assess multi-population genetic algorithms performance using intuitionistic fuzzy logic -- Perturbation analysis of a nonlinear matrix equation arising in Tree-like stochastic processes -- On Two-Way Generalized Nets -- Variational methods for stable time discretization of first-order differential equations -- Numerical solutions of ordinary fractional differential equations with singularities -- Preliminary analysis of the dynamics of multifractal parameters of the Dow Jones Industrial Average -- Testing performance and scalability of the pure MPI model versus hybrid MPI-2/OpenMP model on the heterogeneous supercomputer Avitohol -- Analyses and Boolean operation of 2D polygons -- Ant Colony Optimization Algorithm for Workforce Planning: Inuence of the Algorithm Parameters -- Convergence of homotopy perturbation method for solving of two-dimensional fuzzy Volterra functional integral equations -- Iterative method for numerical solution of two-dimensional nonlinear Urysohn fuzzy integral equations.