RT Journal Article SR Electronic T1 The CAPM and beta in an imperfect market JF The Journal of Portfolio Management FD Institutional Investor Journals SP 78 OP 79 DO 10.3905/jpm.1986.409072 VO 12 IS 4 A1 Ramon P. DeGennaro A1 Sangphill Kim YR 1986 UL https://pm-research.com/content/12/4/78.abstract AB