https://collaborate.princeton.edu/en/publications/black-hole-greybody-factors-and-absorption-of-scalars-by-effectiv/fingerprints/
Black hole greybody factors and absorption of scalars by effective strings - Fingerprint -...
black hole
https://researchconnect.buffalo.edu/en/publications/greybody-factors-for-a-black-hole-in-massive-gravity/
Greybody factors for a black hole in massive gravity - SUNY University at Buffalo