The text above gives the following result in the article (see also Notes section below):
This is an example of multiple references to the same footnote.[1]
Such references are particularly useful when citing sources, when different statements come from the same source.[1]
A concise way to make multiple references is to use empty ref tags, which have a slash at the end.[1]
Remember that when you refer to the same footnote multiple times, the text from the first reference is used.