@article{Azevedo:96831,
      author        = "Azevedo, João and Fernández-García, M.P. and Magén,
                       César and Mendes, Adélio and Araújo, João P. and Sousa,
                       Célia T.",
      title         = "{Double-walled iron oxide nanotubes via selective chemical
                       etching and Kirkendall process}",
      year          = "2019",
}