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Discover LudwigThe phrase "observed previously" is correct and usable in written English.
It can be used when referring to something that has been noted or seen at an earlier time.
Example: "The results of the experiment were consistent with those observed previously in similar studies."
Alternatives: "noted earlier" or "seen before."
Exact(60)
Instead of reading, as I observed previously, they just read.
To our knowledge, this phenomenon has not been observed previously.
These compounds were not observed previously in electrolyzed solutions by liquid or gas chromatography/mass spectrometry.
RH3 adopted the intended fold, which has not been observed previously in biological proteins.
As observed previously in rowing, kayaking an ergometer becomes more and more popular.
These numbers were within the range of cultivable bacteria observed previously in Boom Clay.
The complex features a unique peptide binding mode not observed previously.
Similar impacts to those observed previously on the bacterial production were noted.
This confirms similar results observed previously in the field (Long et al. 2000).
They are Zr-rich [0001]α rod/lath particles observed previously by STEM examinations (Figure 1a).
A similar trend was observed previously by Ozer et al. (2010).
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com