Algarni, E. (2020) “Distances to Planetary Nebulae Using Astrometric Data of Gaia DR2”, International Journal of Sciences: Basic and Applied Research (IJSBAR), 54(4), pp. 80–110. Available at: https://gssrr.org/JournalOfBasicAndApplied/article/view/11904 (Accessed: 22 May 2026).