Jonathan Baxter Peter L. Bartlett Lex Weaver Experiments with Infinite-Horizon, Policy-Gradient Estimation. 351-381 2001 15 J. Artif. Intell. Res. (JAIR) http://www.cs.washington.edu/research/jair/abstracts/baxter01b.html db/journals/jair/jair15.html#BaxterBW01