"Attack on Planet Eminiar Seven" was a science fiction story written by Robert Hamner and Gene L. Coon for the August 1953 issue of Astounding Science Fiction magazine. (DS9: "Far Beyond the Stars")
This is a reference to the Star Trek: The Original Series episode "A Taste of Armageddon" by Gene L. Coon, which featured the planet Eminiar VII. The matte painting for the planet was featured on the cover of the magazine.
The prop magazine can be seen at YourProps.com. [1]