@article{10_4064_am_14_2_177_183,
     author = {I. Kopoci\'nska and B. Kopoci\'nski},
     title = {Queueing systems with mixed input stream and feedback},
     journal = {Applicationes Mathematicae},
     pages = {177--183},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {1974},
     doi = {10.4064/am-14-2-177-183},
     zbl = {0296.60066},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-14-2-177-183/}
}