Kurniawan, B. W., Pujiharjanto, C. A. and Nilmawati , N. (2023) “Constructing an Optimal Portfolio with a Single Index Model on the Shares of Bumn Companies Listed in the IDXBUMN20 Index on the Indonesia Stock Exchange”, West Science Business and Management, 1(05), pp. 386–395. doi: 10.58812/wsbm.v1i05.499.