Melis, A. et al. (2020). A Hybrid Control Algorithm for Gradient-Free Optimization using Conjugate Directions⁎Research partially supported by the European Project "AerIal RoBotic technologies for professiOnal seaRch aNd rescuE" (AirBorne), Call: H2020, ICT-25-2016/17, Grant Agreement no: 780960, by NSF Grants no. ECS-1710621 and CNS-1544396, by AFOSR Grants no. FA9550-16-1-0015, FA9550-19-1-0053, and Grant no. FA9550-19-1-0169, and by CITRIS and the Banatao Institute at the University of California.. IFAC-PapersOnLine. 53 (2), pp. 5825-5830. [Online].