@article{Martínez-Pérez:131537,
      author        = "Martínez-Pérez, M. J. and Müller, B. and Lin, J. and
                       Rodriguez, L. A. and Snoeck, E. and Kleiner, R. and Sesé,
                       J. and Koelle, D.",
      title         = "{Magnetic vortex nucleation and annihilation in bi-stable
                       ultra-small ferromagnetic particles}",
      year          = "2020",
}