Chinmay Garanayak Dwaipayan Mukherjee Bearing-Only Formation Control for Double Integrators and Non-Holonomic Agents with Elevation-Angle Rigidity. 736-741 2023 CoDIT https://doi.org/10.1109/CoDIT58514.2023.10284157 conf/codit/2023 db/conf/codit/codit2023.html#GaranayakM23