Kimball, Chase, Talbot, Colm, Berry, Christopher P, Zevin, Michael, Thrane, Eric, Kalogera, Vicky, Buscicchio, Riccardo, Carney, Matthew, Dent, Thomas, Middleton, Hannah, Payne, Ethan, Veitch, John, and Williams, Daniel. Evidence for Hierarchical Black Hole Mergers in the Second LIGO–Virgo Gravitational Wave Catalog. Retrieved from https://par.nsf.gov/biblio/10284639. The Astrophysical Journal Letters 915.2 Web. doi:10.3847/2041-8213/ac0aef.

Kimball, Chase, Talbot, Colm, Berry, Christopher P, Zevin, Michael, Thrane, Eric, Kalogera, Vicky, Buscicchio, Riccardo, Carney, Matthew, Dent, Thomas, Middleton, Hannah, Payne, Ethan, Veitch, John, & Williams, Daniel. Evidence for Hierarchical Black Hole Mergers in the Second LIGO–Virgo Gravitational Wave Catalog. The Astrophysical Journal Letters, 915 (2). Retrieved from https://par.nsf.gov/biblio/10284639. https://doi.org/10.3847/2041-8213/ac0aef

Kimball, Chase, Talbot, Colm, Berry, Christopher P, Zevin, Michael, Thrane, Eric, Kalogera, Vicky, Buscicchio, Riccardo, Carney, Matthew, Dent, Thomas, Middleton, Hannah, Payne, Ethan, Veitch, John, and Williams, Daniel. "Evidence for Hierarchical Black Hole Mergers in the Second LIGO–Virgo Gravitational Wave Catalog". The Astrophysical Journal Letters 915 (2). Country unknown/Code not available. https://doi.org/10.3847/2041-8213/ac0aef. https://par.nsf.gov/biblio/10284639.

@article{osti_10284639,
place = {Country unknown/Code not available}, title = {Evidence for Hierarchical Black Hole Mergers in the Second LIGO–Virgo Gravitational Wave Catalog}, url = {https://par.nsf.gov/biblio/10284639}, DOI = {10.3847/2041-8213/ac0aef}, abstractNote = {}, journal = {The Astrophysical Journal Letters}, volume = {915}, number = {2}, author = {Kimball, Chase and Talbot, Colm and Berry, Christopher P and Zevin, Michael and Thrane, Eric and Kalogera, Vicky and Buscicchio, Riccardo and Carney, Matthew and Dent, Thomas and Middleton, Hannah and Payne, Ethan and Veitch, John and Williams, Daniel}, editor = {null} }