@Article{ 
  KrySte17,
  author = { Kryzhevich, Sergey and Stepanov, Eugene },
  title = { The saga of a fish: from a survival guide to closing lemmas },
  journal = { J. Differential Equations },
  year = { 2019 },
  doi = { https://doi.org/10.1016/j.jde.2019.04.010 },
  volume = { 267 },
  number = { 6 },
  pages = { 3442-3474 },
  URL = { http://cvgmt.sns.it/paper/3703/ },
  note = { cvgmt preprint}
}