RT Journal Article SR Electronic T1 Is Beta Viable for German Stocks? JF The Journal of Investing FD Institutional Investor Journals SP 34 OP 62 DO 10.3905/joi.1992.34 VO 1 IS 1 A1 Hans-Jorg Frantzmann YR 1992 UL https://pm-research.com/content/1/1/34.abstract AB