@article{suzuki_takasugi_umetsu_1998, 
  title={Perturbations of Kerr-de Sitter Black Holes and Heun's Equations}, 
  volume={100}, 
  DOI={10.1143/ptp.100.491}, 
  publisher={Oxford University Press (OUP)}, 
  author={Suzuki and Takasugi and Umetsu}, 
  year={1998}, 
  month={Sep}
  }