Minor corrections in referencing Infante-Sainz+2019

Until now the actual journal webpage was used for Raul's paper. However,
the journal webpage needs authorized access for people to read it,
therefore its will be inaccessible for many people. A better and more well
known place for the paper (atleast in astronomy) is the ADS link. In the
ADS link, if someone has access to the journal, they will get the journal's
version and if not, they will get the arXiv version. It also has a common
BibTeX export tool for all journals. We had also done this for the other
papers in that list.

With this commit, I thus changed the URL for the paper, and also removed
the "issue" number (4 in this case), since that is mostly irrelevant, only
the volume and page numbers are usually used for the other papers too.

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