1. H. Hirano, D. Semura, K. Sakamoto, T. Toyama, D. H. E. Setiamarga, “Dynamic changes of organic content over time in the sea sludge collected from the Gobo/Hidaka coastal area in Wakayama, southwest Japan.” in IOP Conference Series: Earth and Environmental Science 176, 012007 (2018)
2. H. Hirano, D. H. E. Setiamarga, “Compositional changes in sea sludge samples from Hidaka port in Wakayama, Southwest Japan, collected monthly for a period of 16 months.” in Proceedings of the 9th international conference on Geotechnique, Construction Materials and Environment (GEOMATE), pp. 831–836 (2019)
3. K. Takitani, Y. Kotari, K. Sakamoto, H. Hirano, “Results of measuring organic contents in liquid samples by Thermo-Gravimetry Analysis.” in Proceedings of the 28th Ocean Engineering Symposium 2020, OES28-018, 4 (CD) [in Japanese] (2020)
4. H. Hirano, D. H. E. Setiamarga, Int. J. GEOMATE 16, 49–55 (2019)
5. H. Hirano, “Research about composition and change by time of sea sludge in Hidaka port on Wakayama Part 2: Change of organic contents by time.” in Proceedings of the 53th Annual Conference of Japan Society on Water Environment 2019, P-I09, pp. 561 [in Japanese] (2019)