The paper: "The Vanishing and Appearing Sources during a Century of Observations Project. I. USNO Objects Missing in Modern Sky Surveys and Follow-up Observati

The paper: "The Vanishing and Appearing Sources during a Century of Observations Project. I. USNO Objects Missing in Modern Sky Surveys and Follow-up Observations of a "Missing Star"" Beatriz Villarroel et al 2019 December 12, The Astronomical Journal, Volume 159, Number 1 https://doi.org/10.3847/1538-3881/ab570f https://doi.org/10.3847/1538-3881/ab570f