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Well, Akira Toriyama himself hasn't made anything comparable to DBZ... he has done a few longer series (Doctor Slump) but they are very different from it. Other than that he mostly made short one-shot mangas. If you liked DBZ however, you should watch both Naruto (which I assume you are already doing, since you are here) & One Piece. The authors of those two series have Toriyama as a primary source for inspiration, thus, they are similar to DBZ but MUCH better.