Zhicheng Hou Isabelle Fantoni Interactive Leader-Follower Consensus of Multiple Quadrotors Based on Composite Nonlinear Feedback Control. 1732-1743 2018 26 IEEE Trans. Control. Syst. Technol. 5 https://doi.org/10.1109/TCST.2017.2738602 db/journals/tcst/tcst26.html#HouF18