Optimal design of system of cross-beamsArjassov, Gennadi; Žigailov, SergeiMechatronic systems and materials IV2013 / p. 675-680 : ill Optimization of lift force of mini quadrotor helicopter by changing of gap size between rotorsAleksandrov, Dmitri; Penkov, IgorMechatronic systems and materials IV2013 / p. 226-231 : ill