@article{Kraniotis:2016KX,
  author = "Kraniotis, G.",
  title = "{Gravitational lensing and frame dragging of light in the Kerr-Newman and the Kerr-Newman-(anti) de Sitter black hole spacetimes}",
  doi = "10.22323/1.258.0073",
  journal = "PoS",
  year = 2016,
  volume = "PLANCK 2015",
  pages = "073"
}