@article{10_14708_ma_v9i17_1518,
     author = {Roman R\'o\.za\'nski},
     title = {Properties of efficient sequential plans for a birth and death process},
     journal = {Mathematica Applicanda},
     pages = { 83--93},
     publisher = {mathdoc},
     volume = {9},
     number = {17},
     year = {1981},
     doi = {10.14708/ma.v9i17.1518},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/ma.v9i17.1518/}
}