"paper challenges" is a perfectly acceptable phrase in written English.
You can use it to refer to any kind of difficulty or obstacle posed by a piece of paper, such as a test or form. For example, "Filling out tax forms can be one of the most daunting paper challenges for many people."
The paper challenges much of our understanding of human history, a fact not lost on the scientists.
A3 Paper Challenges U.N. Court Lawyers for The Washington Post challenged the United Nations war crimes tribunal's issuance of a subpoena to a former reporter for the newspaper.
The headwinds Gordon cites include: Taken in full, Gordon's controversial N.B.E.R. paper challenges our belief that innovation and invention will continue to drive sustained expansion in the United States.
This paper challenges these arguments.
Our paper challenges these assumptions.
This paper challenges and extends earlier seminal work.
But the case that might have provided the clearest evidence of unfair exclusion – Jones's apparent flat rejection of a paper challenging his findings by the Swedish scientist Lars Kamel – was not investigated.
In March 2013, Musaala wrote a paper challenging priestly celibacy and criticizing African priests who abuse minors or father children and abandon them.
In the wake of an April 2007 Washington Post column that was highly critical of Reid's leadership on Iraq, every single member of the Senate Democratic Caucus signed a letter to the paper, challenging its assertions.
That section now includes explicit references both to our paper (Carter & Duax, 2002) and to the paper challenging aspects of the work (Williams, et al., 2008), as well as the rebuttal published by Rodin, Rodin, & Carter (2009).
This is current controversy over whether Nrg1 has mitogenic effects in the adult heart, amplified even more by a recent paper challenging this view published in December during the review of our manuscript (Reuter et al., 2014, PLoS One, 9(12): e115871).
