Analisis portofolio optimal dengan metode markowitz metode graham dan single index model studi kasus pada saham indeks lq45 dan saham indeks bisnis 27 di bursa efek indonesia = Optimal portfolio analysis using markowitz method graham and single index model case study at lq45 stock index and bisnis 27 stock index in the indonesia stock exchange / Muslikhin B Ridwan - Muslikhin B. Ridwan, author (2014)