@article{10_4064_am_17_4_539_548,
     author = {G. Sankaranarayanan and K. Usha and R. Ramanarayanan},
     title = {The single server queue with {Erlang} input and {semi-Markov} service times},
     journal = {Applicationes Mathematicae},
     pages = {539--548},
     publisher = {mathdoc},
     volume = {17},
     number = {4},
     year = {1980},
     doi = {10.4064/am-17-4-539-548},
     zbl = {0568.60088},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-17-4-539-548/}
}