@article{IM2_2012_76_6_a10,
     author = {A. Ya. Chervonenkis},
     title = {On some properties of classes of events for which the conditions
},
     journal = {Izvestiya. Mathematics },
     pages = {1271--1285},
     publisher = {mathdoc},
     volume = {76},
     number = {6},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2012_76_6_a10/}
}