@phdthesis{oai:tsukuba.repo.nii.ac.jp:02000824,
 author = {Fajar, Setiawan},
 month = {},
 note = {2020},
 school = {筑波大学, University of Tsukuba},
 title = {Long-Term Change of the Secchi Disk Depth in Indonesian Lakes Shown by Landsat TM and ETM+ Data},
 year = {2021}
}