Hauschild Roier, Gabriel R; Storchi-Bergmann, Thaisa; McDermid, Richard M; Walsh, Jonelle L; Tan, Joanne; Cohn, Jonathan; Krajnovic, Davor; Greene, Jenny; Valluri, Monica; Gültekin, Kayhan; Thater, Sabine; van de Ven, Glenn; Gebhardt, Karl; Lützgendorf, Nora; Boizelle, Benjamin D; Ma, Chung-Pei; Barth, Aaron J (29 March 2022). "Gas inflows in the polar ring of NGC 4111: the birth of an AGN". Monthly Notices of the Royal Astronomical Society. 512 (2): 2556–2572. doi:10.1093/mnras/stac634. hdl:10183/239481.
Hauschild Roier, Gabriel R; Storchi-Bergmann, Thaisa; McDermid, Richard M; Walsh, Jonelle L; Tan, Joanne; Cohn, Jonathan; Krajnovic, Davor; Greene, Jenny; Valluri, Monica; Gültekin, Kayhan; Thater, Sabine; van de Ven, Glenn; Gebhardt, Karl; Lützgendorf, Nora; Boizelle, Benjamin D; Ma, Chung-Pei; Barth, Aaron J (29 March 2022). "Gas inflows in the polar ring of NGC 4111: the birth of an AGN". Monthly Notices of the Royal Astronomical Society. 512 (2): 2556–2572. doi:10.1093/mnras/stac634. hdl:10183/239481.