Bernhard C. Geiger, Christoph Temmel. Lumpings of Markov Chains, Entropy Rate Preservation, and Higher-Order Lumpability. J. Applied Probability, 51(4):1114-1132, 2014. [doi]
@article{GeigerT14,
title = {Lumpings of Markov Chains, Entropy Rate Preservation, and Higher-Order Lumpability},
author = {Bernhard C. Geiger and Christoph Temmel},
year = {2014},
doi = {10.1017/S0021900200012018},
url = {http://dx.doi.org/10.1017/S0021900200012018},
researchr = {https://researchr.org/publication/GeigerT14},
cites = {0},
citedby = {0},
journal = {J. Applied Probability},
volume = {51},
number = {4},
pages = {1114-1132},
}