Коляденко, Ю., and А. Д. Муслим. “WiMAX-Technology for Broadband Wireless Access. Beamforming or AAS Technogies”. Eastern-European Journal of Enterprise Technologies, vol. 3, no. 5(45), May 2010, pp. 22-25, doi:10.15587/1729-4061.2010.2827.