Raisal, Abu Yazid, Observatorium Ilmu Falak Universitas Muhammadiyah Sumatera Utara, Indonesia

• Indonesian Review of Physics Vol. 3 No. 1 (2020) - Articles
  Measuring the Apparent Magnitude of Planet Mars on August 1st and October 2nd, 2018 at the Falak Observatory at Muhammadiyah University of North Sumatera
  Abstract  PDF