1.
There is no PDF or HTML link as you see in #3.
Look below the citation and below Add to Folder. Note the words- "View this article from Science Direct". Click this to LINK to Science Direct for the full text.
2.
Here you have another option for finding full-text- see the words More Options through LinkSource.
Click this. Now you will see other databases or online resources where this article might be found. Check the dates and try each link until you find the article.