It's the usual simple past vs. present perfect distinction. g.
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anglista2008
and what if it is me who writes the sentence in the footnotes of a thesis? should I rather use the present perfect or the past simple?
anglista2008I understood "the author" to be the author of the survey to which you are referring. Are you saying that "the author" is you?
hmm... some time ago... can't really say right now...
but isn't the time of my decision that actually matters?
anglista2008
I'm not the author of the survey as such, but I'm the one who has decided to delimit its outcome... And I a\have to let the readers know that I've done it/did it ... What I don't know is whether I should let them know about that in the form of the present perfect or the past simple...