oryahalom wrote:
"Researches claim to have developed new "nano-papers" incorporating tiny cellulose fibers, which they allege give them the strength of cast iron".
In my humble opinion, there is one problem in the cited sentence, although I'm not sure whether it should be categorized as a "pronoun ambiguity" error.
Logically, in case no pronoun is used, the sentence can be rewritten as follow:
Researches claim to have developed new "nano-papers" incorporating tiny cellulose
...
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