• Ahmad, Abushattal (2018a). “The 12th Arab Conference for Astronomy and Space Science, entitled: Extrasolar planets in spectroscopic binary systems: Stability and Habitability, (The Royal Jordanian Geographic Center, Jordan. May, 2018)”. In: p. 34. • – (2018b). “The 12th Arab Conference for Astronomy and Space Science, (The Royal Jordanian Geographic Center, Jordan. May, 2018), entitled: CORAVEL Radial Velocity Observations at Cambridge Observatory, UK.”. In: p. 26. • Ahmad, Abushattal et al. (2014). “Second International Conference on Arabs’ and Muslims’ History of Science, (University of Sharjah, Sharjah, UAE. December, 2014), entitled: Physical Properties and Dynamical Elements of Spectroscopic Binary Stars”. In: p. 103.. Las Jornadas de Trabajo en Mecánica Celeste (JTMC) - Ramon Maria Aller Observatory - Santiago de Compostela - Spain (25-27/07/2018)