Tambunan, R., W. S. Pranowo, and D. Adrianto. “Analisa Variasi Nilai Konstanta Komponen Harmonik Tahunan Metode Admiralty Dengan Prediksi Elevasi Pasang Surut Di Sendang Biru Malang: Analysis of Variations in the Value of Annual Harmonic Component Constants in the Admiralty Method With Prediction of Tidal Elevation in Sendang Biru Waters, Malang”. Jurnal Chart Datum, vol. 7, no. 1, July 2021, pp. 11-16, doi:10.37875/chartdatum.v7i1.206.