@Master'sThesis{LIS53,
title = {Learning Hierarchies in Stochastic Domains},
author = {Leslie Pack Kaelbling and Ronny Ashar},
year = {1994},
url = {https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.407.6116&rep=rep1&type=pdf},
booktitle = {Computational Learning Theory and Natural Learning Systems},
editor = {Russell Greiner},
publisher = {MIT Press},
}