In later weeks, we will call the general form of this technique the Maybe type, and the general strategy for deploying this type the Maybe monad.
-Kaplan, D. 1989. "Demonstratives. InJ. Almog, J. Perry, & H. Wettstein
+Kaplan, D. 1989. "Demonstratives. In J. Almog, J. Perry, & H. Wettstein
(Eds.), Themes from Kaplan (pp. 481-563)."