Exploring the Chemical Composition and Double Horizontal Branch of the Bulge Globular Cluster NGC 6569DOI: info:10.3847/1538-3881/aaa294v. 15571
Johnson, Christian I., Rich, R. Michael, Caldwell, Nelson, Mateo, Mario, Bailey, John I., III, Olszewski, Edward W., and Walker, Matthew G. 2018. "Exploring the Chemical Composition and Double Horizontal Branch of the Bulge Globular Cluster NGC 6569." The Astronomical Journal, 155 71. https://doi.org/10.3847/1538-3881/aaa294.