@article{articleffe6ee45,
title   = {Ages of the bulge globular clusters NGC 6522 and NGC 6626 (M28) from HST proper-motion-cleaned color–magnitude diagrams*},
author = {Kerber, L. O and Nardiello, D and Barbuy, Beatriz Leonor Silveira and Bica, E},
year = {2018},
doi = {10.3847/1538-4357/aaa3fc},
journal   = {The Astrophysical Journal}
}