Copestake, A., Flickinger, D. P., Sag, I. A., & Pollard, C. (2005). Minimal Recursion Semantics. An introduction. In Research on Language and Computation. 3:281–332 https://www.cl.cam.ac.uk/~aac10/papers/mrs.pdf
"LogonTop - Deep Linguistic Processing with HPSG". DELPH-IN. 2013-07-30. Retrieved 2015-10-13. http://moin.delph-in.net/LogonTop
Copestake, A., Flickinger, D. P., Sag, I. A., & Pollard, C. (2005). Minimal Recursion Semantics. An introduction. In Research on Language and Computation. 3:281–332 https://www.cl.cam.ac.uk/~aac10/papers/mrs.pdf
"English Resource Grammar and Lexicon". DELPH-IN. 2013-05-23. Retrieved 2015-10-13. http://www.delph-in.net/erg/