@article{ISU_2015_15_3_a0,
     author = {S. Yu. Antonov and A. V. Antonova},
     title = {To {Chang} theorem},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {247--251},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2015_15_3_a0/}
}