@article{10_4064_am_12_4_373_384,
     author = {I. Kopoci\'nska and B. Kopoci\'nski},
     title = {Queueing systems with feedback},
     journal = {Applicationes Mathematicae},
     pages = {373--384},
     publisher = {mathdoc},
     volume = {12},
     number = {4},
     year = {1971},
     doi = {10.4064/am-12-4-373-384},
     zbl = {0244.60067},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-12-4-373-384/}
}