The article discusses how monoprofile cities in the Donbas region changed from the late 1940s to the 1980s. The researchers looked at how these cities evolved in terms of their administrative status and how they fit into the overall structure of the region. They found that the number of monoprofile cities more than doubled during this time, reaching over sixty by the late 1980s. These cities played a significant role in the industrial development of the region, but often did not have the same level of urban criteria as larger cities. This impacted their growth and development, as they were often secondary to more powerful urban centers in the region.