Here's some of the best white-papers that I have come across this year (some of them mine!):
- The Irrational Investor, by Douglas Borthwick and Frank T. Troise.
- U.S. Economic Prospects: Secular Stagnation, Hysteresis, and the Zero Lower Bound, by Lawrence Summers
- The Case for Unencumbering Interest Rate Policy at the Lower Bound, by Marvin Goodfriend
Books that I would highly recommend for you!