Citing an article that the journal serialized
The general rule is to always, always cite material as it is published, even if that somehow looks weird to you. This monograph has, for reasons we all can only speculate about, been split into 5 papers, so you cite it as if it were 5 papers. You do not pretend like it was somehow a single virtual paper. Even if the papers have partially the same name, at least the volume or issue number should be different. Yes, this will look like you have a duplicate entry in your bibliography to the casual observer, but I am afraid this can't be helped.

Further, note that you probably only need to cite a subset of these 5 installments. Again, treat them as different papers, and only cite the subset that actually contains arguments that are relevant to the article you are currently working on.