I'm not sure what you mean by your last remarks, but perhaps it's wiser not to limit responses to people who already agree with your preconceived notions if those notions are either wrong, debatable or at least in need of clarification.
As for a reference to an infinite universe, I am not sure how many formal papers will address the question directly, but it's certainly implicit in the definition of the "FLRW" metric, that appears to match well the observed "shape" of the universe. The point is that the range of the coordinate r, that stands for the radius in some sense, extends from 0 to infinity -- so that any paper discussing this metric will automatically include that assumption, that the universe is infinite.
No observation can do more than confirm the idea that this metric is a good fit to the data, but the fit would perhaps be equally good if the universe were finite, but of a size far greater than we can ever hope to see (ie, the range of r is huge, but has some upper limit after all; or perhaps the metric is only "good enough" for what we can observe, but beyond that breaks down and is wrong).
The question, then, of whether or not the Universe is truly infinite is likely to remain unanswered. I don't think that most scientists would bother to even try, at least not directly: "Here's some finite, bounded shape the Universe could take: does this work?" If not, then you could try another shape, and so on, but the ultimate possibility of an infinite universe would only be sorted if you did manage to find a finite shape that worked.