@article{18974,
  author = {Heritier Stephane and Hudson Malcolm and Lo S.},
  title = {Saddlepoint Approximation for Semi-Markov Processes with application to a cardiovascular randomized study},
  year = {2009},
  journal = {Computational Statistics & Data Analysis},
  volume = {53},
  number = {1},
  pages = {683-98. },
  language = {eng},
}