Basci, A., K. Can, K. Orman, and A. Derdiyok. “Trajectory Tracking Control of a Four Rotor Unmanned Aerial Vehicle Based on Continuous Sliding Mode Controller”. Elektronika Ir Elektrotechnika, vol. 23, no. 3, June 2017, pp. 12-19, doi:10.5755/j01.eie.23.3.18325.