@article{10_4064_am_18_2_169_175,
     author = {K. Usha},
     title = {The {PH/M/c} queue with varying environment},
     journal = {Applicationes Mathematicae},
     pages = {169--175},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {1983},
     doi = {10.4064/am-18-2-169-175},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-18-2-169-175/}
}