@article{MO_2018_4_a6,
     author = {N. A. Rashevsky},
     title = {Graphs as visual models for conditional probability problems},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {50--60},
     year = {2018},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2018_4_a6/}
}