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Speaking as an academic and professor, I say you are right. "authored by" implies sole authorship and denies others the credit they are due. Use co-author, or "John Doe, et al" for specific papers....
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/45302 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/45302 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Speaking as an academic and professor, I say you are right. "authored by" implies sole authorship and denies others the credit they are due. Use co-author, or "John Doe, et al" for specific papers. Or if you are talking about a mix and John Doe is the sole author of at least one, then "authored or co-authored by" is appropriate.