See the list of PDL team members.
We suggest the following guidelines (copy-and-paste into LaTeX):
Portions of the analysis presented here made use of the Perl Data Language\footnote{The Perl Data Language (PDL) has been developed by K. Glazebrook, J. Brinchmann, J. Cerney, C. DeForest, D. Hunt, T. Jenness, T. Lukka, R. Schwebel, and C. Soeller and can be obtained from https://pdl.perl.org} which provides a high-level numerical functionality in the Perl scripting language (Glazebrook & Economou, 1997).
Portions of the analysis presented here made use of the Perl Data Language (PDL) developed by K. Glazebrook, J. Brinchmann, J. Cerney, C. DeForest, D. Hunt, T. Jenness, T. Lukka, R. Schwebel, and C. Soeller and can be obtained from https://pdl.perl.org. PDL provides a high-level numerical functionality for the Perl scripting language (Glazebrook & Economou, 1997).
Glazebrook & Economou 1997, The Perl Journal, 5, 5
Glazebrook & Economou 1997, Dr. Dobb's Journal, Sep 01, https://www.drdobbs.com/pdl-the-perl-data-language/184410442
The Dr. Dobb's Journal article is a reprint of the Perl Journal article. Dr. Dobb's archived The Perl Journal articles when the latter ceased publication.