@unpublished{ITNYREPOID3245,
       publisher = {ITNY},
           title = {Similarity: Hydrochemistry Of Groundwater In Yogyakarta Graben, Area Of Code Sub Drainage,  Yogyakarta, Indonesia},
          author = {Listiyani Retno Astuti},
             url = {https://repository.itny.ac.id/id/eprint/3245/}
}