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Naslund, 1996, "A Class of Options with Stochastic Lives and an Extension of the Black-Scholes Formula", European Journal of Operational Research, 91:229-234
For this purpose, the deemed exercise rules apply separately to each class of options and to each 5% shareholder, each holder of an option who could be a 5% shareholder if the option were deemed exercised, and each combination of such persons.
Another class of options is the flexibility (switching) option.