Driyono, B. ., & Nafkar Jaya, M. (2020). Innovation Design of Digital Clinometer Papi (Precision Approach Path Indicator) Angle Measurer Instrument at Yogyakarta Adisutjipto International Airport. Airman: Jurnal Teknik Dan Keselamatan Transportasi, 3(1), 88–95. https://doi.org/10.46509/ajtk.v3i1.160