@article{AV_1936_6_3_a1,
     author = {Frant{\'\i}kov\'a, Ji\v{r}ina},
     title = {Some approximate formulas},
     journal = {Aktu\'arsk\'e v\v{e}dy},
     pages = {102--106},
     year = {1936},
     volume = {6},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AV_1936_6_3_a1/}
}