Researchers claim to have developed new "nano-papers" incorp

Researchers claim to have developed new "nano-papers" incorporating tiny cellulose fibers, which THEY allege give THEM the strength of cast iron.
Now, the explanation behind the correction is that THEY / THEM in the aforementioned sentence can refer to both the researchers or the nano-papers. There is ambiguity and hence it rephrases the sentence as follows:-
Researchers claim to have developed new "nano-papers" incorporating tiny cellulose fibers, which allegedly give THESE MATERIALS the strength of cast iron.

Hello every one. I am new to the group. Planning to write GMAT by the end of June'12. Just started with preps. Don't know how this will be possible with only weekends to study.

Anywho, I was going through the SC tips from Manhattan. I got stuck at some tips and could not swallow. Kindly help me with the usage of these pronouns.

Fine, my first doubt is that does WHICH have any ambiguity in this? And does comma have any effect on the pronouns?

2. Another sentence
Confronted by radical changes in production and distribution, modern Hollywood studios are attempting various experiments in an effort to retain THEIR status as the primary arbiter of movie consumption.
According to MR, this sentence does not have any error. But my doubt is that when THEY can refer to nano-papers in the first sentence, then cannot "experiments" refer to THEIR? And then, there will be an ambiguity and the sentence will be incorrect.



Thanks people...