@article{Benito1982,
author = {Benito, F.},
title= {Calculating the variance in Markov-processes with random reward},
year = {1982},
doi = {10.1007/BF02888435},
journal = {Trabajos de Estadística y de Investigación Operativa},
volume = {33},
number = {3},
pages = {73--85},
}