> As far as I'm aware, citations in published papers should always be
> proper case, but are there any cases where a journal should be cited
> without periods in the abbreviated form? I'm aware of the edge cases
> like PLOS, JAMA, BMJ, but what I'm wondering is if anyone knows of any
> instances where a journal which is normally abbreviated as Anal.
> Biochem. would instead be formatted as Anal Biochem (without periods)
> in the references list/bibliography for a paper?
>

You could figure this out programatically by looking up the titles. JAMA,
PLOS, and BMJ are not abbreviations. Even though they were abbreviations at
one time, they are now the proper names of those publications.

kyle