@article{10_14708_ma_v11i23_1600,
     author = {Boles{\l}aw Kopoci\'nskiI},
     title = {Classes of reliability functions},
     journal = {Mathematica Applicanda},
     pages = { 37--54},
     publisher = {mathdoc},
     volume = {11},
     number = {23},
     year = {1983},
     doi = {10.14708/ma.v11i23.1600},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/ma.v11i23.1600/}
}