@Article{ 
  draponste02,
  author = { Drakhlin, Mikhail and Ponosov, Arkady and Stepanov, Eugene },
  title = { On some classes of operators determined by the structure of their memory },
  journal = { Proc. Edinburgh Math. Soc. },
  year = { 2002 },
  volume = { 45 },
  number = { 2 },
  pages = { 467-490 },
  URL = { http://cvgmt.sns.it/paper/1651/ },
  note = { cvgmt preprint}
}