V6.3.3 dev

[villegar]

Addresses the following issue:

If there are references describing the methods in your package, please
add these in the description field of your DESCRIPTION file in the form

authors (year) <doi:...>
authors (year, ISBN:...)
or if those are not available: <https:...>

with no space after 'doi:', 'https:' and angle brackets for
auto-linking. (If you want to add a title as well please put it in
quotes: "Title")

For more details:<https://contributor.r-project.org/cran-cookbook/description_issues.html#references>

[StuartWheater]

Consistent will papers