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reference. Gravitational lensing by spinning black holes in astrophysics, and in the movie interstellar [james2015gravitational]

@article{james2015gravitational,
 title = {Gravitational lensing by spinning black holes in astrophysics, and in the movie Interstellar},
 author = {James, Oliver and von Tunzelmann, Eug{\'e}nie and Franklin, Paul and Thorne, Kip S},
 year = {2015},
 journal = {Classical and Quantum Gravity},
 volume = {32},
 number = {6},
 pages = {065001},
 publisher = {IOP Publishing}
}