Laura Banarescu, Claire Bonial, Shu Cai, Madalina Georgescu, Kira Griffitt, Ulf Hermjakob, Kevin Knight, Philipp Koehn, Martha Palmer, and Nathan Schneider. Abstract Meaning Representation (AMR) 1.2.2 Specification, September 2015. URL [AMR guidelines on Github](https://github.com/amrisi/amr-guidelines/blob/c9b899b38f881143887d450be8a8482f810f4942/amr.md).