@article{sim91,
  author = {A. Simonian and J. Virtamo},
  title = {Transient and stationary distri¬butions for fluid queues and input processes with a density},
  journal = {SIAM Journal of Applied Mathematics},
  year = {1991},
  volume = {51},
  number = {6},
  pages = {1732--1739},
}