@ -43,6 +43,14 @@ Written in 1999.
[GitHub](https://github.com/nineties-retro/sps)
## Pre-Scheme for Guile
A port of Pre-Scheme from Scheme 48 to Guile.
Started in 2022.
[GitLab](https://gitlab.com/flatwhatson/guile-prescheme/)
## Research papers
From the MITRE Corporation: