@article{10_14708_ma_v41i2_389,
     author = {Srinivas R. Chakravarthy},
     title = {Analysis of a multi-server queueing model with vacations and optional secondary services},
     journal = {Mathematica Applicanda},
     pages = { 145--169},
     publisher = {mathdoc},
     volume = {41},
     number = {2},
     year = {2013},
     doi = {10.14708/ma.v41i2.389},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/ma.v41i2.389/}
}