You can use an article for more than just content. Check to see:
The first two sources consistently offer "cited by" information, the others offers it sometimes.
If you have an article citation (or title) and want to get to the full-text, consider using Google Scholar Advanced Search to search by article title and then using the Check Simmons Full-Text link to get to the full article.
It pays to learn how to execute articulated ("smart") searches in Google Scholar, especially for systematic reviews and meta-analyses. This means leveraging the power of what are called scope qualifiers like "insubject", "intitle" and "intext."
or the more relaxed smart search:
It also pays to remember that Google Scholar is an "opportunistic" search engine, as it will try to data-mine any resources that could be of relevance rather than honing to the more narrow constraints of a formal database search (often providing riches not otherwise easily uncovered, and some of the discovered resources can themselves contain references or connections to other highly relevant materials).