Clean up Bibliography, format according to JSS guidelines

[egouldo]

JSS quarto template BiBTeX guide

Cleaning up bibtex files is a somewhat tedious task – especially when acquiring the entries automatically from mixed online sources. However, it is important that informations are complete and presented in a consistent style to avoid confusions. JSS requires the following format.

• JSS-specific markup (\proglang, \pkg, \code) should be used in the references.
• Titles should be in title case.
• Journal titles should not be abbreviated and in title case.
• DOIs should be included where available.
• Software should be properly cited as well. For R packages citation("pkgname") typically provides a good starting point.
• See [https://www.jstatsoft.org/pages/view/style#frequently-asked-questions] for technical style details