@Misc{myfancybibtexkey,
author = {Jan Mandel},
title = {A Brief Tutorial on the Ensemble {K}alman Filter},
howpublished = {arXiv:0901.3725v1 [physics.ao-ph]},
month =     jan,
year =      {2009},
OPTnote =      {},
OPTannote =    {},
archivePrefix = {arXiv},
eprint        = {0901.3725},
primaryClass  = {physics.ao-ph}
}

@Article{myotherfancybibtexkey,
  author =       {Geir Evensen},
  title =        {The Ensemble {K}alman Filter: theoretical formulation and practical implementation},
  journal =      {Ocean Dynamics},
  year =         {2003},
  OPTkey =       {},
  volume =    {53},
  number =    {4},
  pages =     {343--367},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {},
  doi = {10.1007/s10236-003-0036-9}
}
