Heidergott, B., Hordijk, A. and Leder, N. (2010). An approximation approach for the deviation matrix of continuous-time Markov processes with application to Markov decision theory Operations Research, 58:918--932.
Heidergott, B. and Farenhorst - Yuan, T. (2010). Gradient estimation for multicomponent maintenance systems with age-replacement policy Operations Research, 58:706--718.
Heidergott, B., Hordijk, A. and Leder, N. (2010). Series expansions for continuous-time Markov chains Operations Research, 58:756--767.