Iqbal, M., L. Silk Moonlight, and R. Puspitaningsih. “E-Aviation Basic Enroute Flight Information Surveillance Using CRAP Method”. Proceeding of International Conference of Advanced Transportation, Engineering, and Applied Social Science, vol. 2, no. 1, Nov. 2023, pp. 644-9, doi:10.46491/icateas.v2i1.1721.