A. Kusumadjati, S. Wardoyo, A. Hirawan, M. I. Alwan, and R. Blanchard, “A development of high sensitivity magnetic sensor based on giant magnetoresistance with simple implementation on smartphone”, App.Sci.Def, vol. 1, no. 3, pp. 75–80, Dec. 2023, doi: 10.58524/app.sci.def.v1i3.280.