@misc{indiciae096553d51016,
  title = {A new class of gradient estimators for queueing systems with real-time constraints},
  author = {Gong, Wei-Bo and Cassandras, Christos G. and Kallmes, Michelle H. and Wardi, Yorai},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19920028771},
  note = {Source identifier: 19920028771}
}