@misc{indiciae77332015aee5,
  title = {Nonlinear robust controller design for multi-robot systems with unknown payloads},
  author = {Song, Y. D. and Anderson, J. N. and Homaifar, A. and Lai, H. Y.},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19930010273},
  note = {Source identifier: 19930010273}
}