@phdthesis{UNY1438,
           title = {HETEROSKEDASTISITAS DALAM MODEL REGRESI DATA PANEL},
          author = {Atri Kartika Widyani},
           month = {November},
            year = {2011},
          school = {UNY},
             url = {http://eprints.uny.ac.id/1438/}
}