The Landmark Crossover
You may also be looking for the series itself.
The Landmark Crossover was a trade paperback  collection, published by Titan Books for the UK and European market in . 

The trade collected the four issues of the TNG/DS9 crossover series done in cooperation between DC Comics and Malibu Comics, which crossed over their Next Generation and Deep Space Nine titles.

Creators 
 Based on:
 Star Trek created by Gene Roddenberry
  created by Rick Berman and Michael Piller
 Writers: Michael Jan Friedman and Mike W. Barr
 Artists:
 Gordon Purcell (pencil art)
 Terry Pallot (ink art)
 Jason Palmer (cover art)
 Editors:
 Margaret Clark & Mark Paniccia

Issues 
 "Prophets and Losses"
 "The Wormhole Trap"
 "Encounter With the Othersiders"
 "The Unseen Enemy"

Landmark Crossover, The