Most of these authors' works are available on major Russian digital libraries. You can typically find formats like :
The largest platform for Russian ebooks. You can search for "Владимир Попов" to find licensed copies for purchase or download. Many titles offer a free "preview" fragment before buying.
Because "Vladimir Popov" is a common name, your search results may include different authors. Below is a guide on where to find and download their books legally and safely. Popular Authors Named Vladimir Popov