@article{AV_1931__2_2_a3,
     author = {Zelenka, A.},
     title = {The grouping of policy values},
     journal = {Aktu\'arsk\'e v\v{e}dy},
     pages = {98--106},
     publisher = {mathdoc},
     volume = {02},
     number = {2},
     year = {1931},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AV_1931__2_2_a3/}
}