Zaiming Liu, Shan Gao. Discrete-time Geo::1::, Geo:::X:::::2::/G::1::, G::2::/1 retrial queue with two classes of customers and feedback. Mathematical and Computer Modelling, 53(5-6):1208-1220, 2011. [doi]
@article{LiuG11,
  title = {Discrete-time Geo::1::, Geo:::X:::::2::/G::1::, G::2::/1 retrial queue with two classes of customers and feedback},
  author = {Zaiming Liu and Shan Gao},
  year = {2011},
  doi = {10.1016/j.mcm.2010.11.090},
  url = {http://dx.doi.org/10.1016/j.mcm.2010.11.090},
  researchr = {https://researchr.org/publication/LiuG11},
  cites = {0},
  citedby = {0},
  journal = {Mathematical and Computer Modelling},
  volume = {53},
  number = {5-6},
  pages = {1208-1220},
}