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Purwitasari, Ines Arinta Dewi (2022) Analisis Portofolio Optimal untuk Pengambilan Keputusan Investasi pada Saham IDXTECHNO (Sektor Teknologi) di Bursa Efek Indonesia Periode Januari-Desember 2021. (Optimal Portfolio Analysis for Investment decision Making on Idxtechno (Tech Sector) Stock of The Indonesian Stock Exchange on January-December 2021). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.