check those who are citing them with the keyword &#x27;oxygen&#x27;: <a href="https:&#x2F;&#x2F;scholar.google.com&#x2F;scholar?q=oxygen&amp;cites=12339973123494715706&amp;scipsc=1" rel="nofollow">https:&#x2F;&#x2F;scholar.google.com&#x2F;scholar?q=oxygen&amp;cites=1233997312...</a> (or without it: <a href="https:&#x2F;&#x2F;scholar.google.com&#x2F;scholar?&amp;cites=12339973123494715706" rel="nofollow">https:&#x2F;&#x2F;scholar.google.com&#x2F;scholar?&amp;cites=123399731234947157...</a> )