%0 Journal Article %A Gary L. Gastineau %T An Introduction to Special-Purpose Derivatives %B Roll Up Puts, Roll Down Calls, and Contingent Premium Options %D 1994 %R 10.3905/jod.1994.407890 %J The Journal of Derivatives %P 40-43 %V 1 %N 4 %U https://jod.pm-research.com/content/iijderiv/1/4/40.full.pdf