The top-down beam parser for MG[+SpIC_mrg] implemented here is described in
- Stabler (2012) Two models of minimimalist, incremental, syntactic analysis. http://www.linguistics.ucla.edu/people/stabler/Stabler12-2models.pdf
See the wiki: https://github.com/epstabler/mgtdb/wiki and READMEs in the subdirectories for details.