@InProceedings{looseFormation,
  author =       {Triwanto Simanjuntak and Masaki Nakamiya and Yasuhiro Kawakatsu},
  title =        {Natural Loose Formation Flying Around Halo Orbits },
  OPTcrossref =  {},
  OPTkey =       {},
  booktitle =    {Advances in the Astronautical Sciences},
  year =         {2011},
  OPTeditor =    {},
  volume =       {140},
  number =       {AAS 11-264},
  OPTseries =    {},
  OPTpages =     {},
  OPTmonth =     {},
  OPTaddress =   {},
  OPTorganization = {},
  OPTpublisher = {},
  note =         {Proceeding of the 21st AAS/AIAA Spaceflight Mechanics Meeting, New Orleans, Lousiana, USA},
  OPTannote =    {}
}