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It is acceptable, this kind of thing is done often in academic papers (to save space, there is often a page-limit in journal articles); but (B) is more clear than (A), that is probably why it was w...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/44414 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/44414 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
It is acceptable, this kind of thing is done often in academic papers (to save space, there is often a page-limit in journal articles); but (B) is more clear than (A), that is probably why it was written that way. Unless saving a handful of words is _very_ important, stick with (B).