@ARTICLE{DuTsi06jas,
  author = {Dutta, A. and Tsiotras, P.},
  title = {Asynchronous Optimal Mixed P2P Satellite Refueling Strategies},
  journal = {Journal of the Astronautical Sciences},
  year = {2006},
  volume = {54},
  pages = {543--565},
  number = {3-4}
}