Reichard, T.A.; Heckman, T.M. The Lopsidedness of Present-Day Galaxies: Connections to the Formation of Stars, the Chemical Evolution of Galaxies, and the Growth of Black Holes (англ.) // The Astrophysical Journal : journal. — IOP Publishing, 2009. — January (vol. 691, no. 2). — P. 1005—1020. — doi:10.1088/0004-637X/691/2/1005. — arXiv:0809.3310.
Reichard, T.A.; Heckman, T.M. The Lopsidedness of Present-Day Galaxies: Connections to the Formation of Stars, the Chemical Evolution of Galaxies, and the Growth of Black Holes (англ.) // The Astrophysical Journal : journal. — IOP Publishing, 2009. — January (vol. 691, no. 2). — P. 1005—1020. — doi:10.1088/0004-637X/691/2/1005. — arXiv:0809.3310.