@article{CTT100676928,
  author = {Hiroyuki Sakurai and Tuan Phung-Duc},
  title = {Two-Way Communication Retrial Queues with Multiple Types of Outgoing Calls},
  journal = {TOP},
  year = 2015,
}

@article{CTT100686151,
  author = {Sakurai, H. and Phung-Duc, T.},
  title = {Scaling Limits for Single Server Retrial Queues with Two-Way Communication},
  journal = {Annals of Operations Research},
  year = 2015,
}