Robuta

https://www.aanda.org/articles/aa/abs/2001/05/aa10257/aa10257.html Blue stragglers in open clusters - III. NGC 7789 | Astronomy & Astrophysics (A&A) blue stragglers open clusters ngc 7789 astronomy astrophysics https://www.muni.cz/vyzkum/publikace/976873 Structural parameters and blue stragglers in Sagittarius dwarf spheroidal galaxy globular clusters... sagittarius dwarf spheroidal structural parameters blue stragglers