Both of these are OK: This was discussed in a previous work of the author/ author's . The article 'a' has nothing to do with it.
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Mister Micawber.
The article 'a' has nothing to do with it.
Mister Micawber.
I see nothing to disagree about. The original poster was relying on 'a' to determine the form of the possessive (of-genitive vs post-genitive). I said that 'a' is irrelevant. I now offer as an example:
This was discussed in the previous work of
Mister Micawber.Perfectly fine with me as well with the relative clause but I have my doubts about this:
Perfectly fine: This is the previous work of mine that I mentioned on the phone to you.
.
Mister MicawberThis was discussed in a previous work of the Author'sHmmm. My ear doesn't accept the second one.
This was discussed in the previous work of the Author's