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I would like to have a way for people to download an article from my document, and I thought of adding a hyperlink to the title of the article as follows:
But I guess it could be done in a better way, so I thought I could do the same and add a 'download' button or something at the end of the reference. There are so many symbols out there that I was wondering if there's a convention on how to do what I'm trying to do or if there are particular symbols that are used for this.
If I'm doing to link to an article, I typically do it with its title.
Make sure that you get the permanent link for the article, however: many sites differentiate between a guaranteed permanent link (often DOI-based) and the way that things happen to be presented and organized at present, which is the URL you end up at and which may not persist.
You can certainly link the title of the article. However, I suggest you have a PDF icon with your article info, and link that instead (or perhaps in addition to) the title.
Why? Because the icon catches people's attention, everyone knows what it means, and you want to encourage people to download it. Suppose I'm a fellow researcher, and I'm looking at your list of articles. Maybe I came across your page while looking for something else, maybe I just want cite one of your other articles, or maybe I'm looking for one of your other articles. In any case, I'm not necessarily intending to download this article, so I'm not actively looking for a link, and I might overlook the link that you provided. But when I see the PDF icon, I realise that the article is there for me if I want it. So I'm likely to take a second look at the article title to see if it might be of interest to me.
If you don't have tight space constraints, the best solution might be adding a field DOI:10.xxxx-xxxx-xxxx-xxxx at the end of the reference, and make it a link to dx.doi.org. In this way even people who get a paper copy of your article can "follow" the links and everyone has a stable permalink for your paper.
Biblatex formats the DOI field like this automatically (link included) if your .bib file includes DOI fields.
If you keep the title in a different colour or with a coloured border, everybody will understand it's a link. If a reader wants to reach the article, he'll first try to click on it, expecting a webpage containing the article or a PDF of it directly. I don't think you need to add anything to what you have.
