RT Journal Article SR Electronic T1 Optimal Investment Proportions in Senior Securities and Equities Under Alternative Holding Periods JF The Journal of Portfolio Management FD Institutional Investor Journals SP 30 OP 36 DO 10.3905/jpm.1993.409457 VO 19 IS 4 A1 Haim Levy A1 Deborah Gunthorpe YR 1993 UL https://pm-research.com/content/19/4/30.abstract AB