Increasing of power characteristics of mini UAV helicopter by changing of its geometrical parametersAleksandrov, Dmitri; Penkov, IgorMachines, technologies, materials : [virtual journal]2012 / p. 30-32 : ill http://trans-motauto.com/sbornik/2012/22.INCREASING%20OF%20POWER%20CHARACTERISTICS%20OF%20MINI%20UAV%20HELICOPTER%20BY%20CHANGING%20OF%20ITS%20GEOMETRICAL%20PARAMETERS.pdf Изнашивание шарниров транспортных цепей = The bushes wear of conveyor chainsPenkov, Igor; Pappel, ToivoMachines, technologies, materials : [virtual journal]2010 / 8/9, p. 37-39 : ill