TY  - RPRT
TI  - Are there echoes of gravitational waves?
AU  - Guo, Bin
AU  - Mathur, Samir D.
PY  - 2022
DO  - 10.1142/s0218271822420093
UR  - https://www.osti.gov/biblio/2420136
ID  - 2420136
ER  -