SUHENDI, E., Z. L. AMANDA, M. T. ULHAKIM, A. SETIAWAN, and D. G. SYARIF. “The Enhancement of Ethanol Gas Sensors Response Based on Calcium and Zinc Co-Doped LaFeO3/Fe2O3 Thick Film Ceramics Utilizing Yarosite Minerals Extraction As Fe2O3 Precursor”. Journal of Metals, Materials and Minerals, vol. 31, no. 2, June 2021, pp. 71-77, doi:10.55713/jmmm.v31i2.1053.