The MESSAGEix Integrated Assessment Model and the ix modeling platform (ixmp): An open framework for integrated and cross-cutting analysis of energy, climate, the environment, and sustainable development. - Daniel Huppmann; Matthew J. Gidden; Oliver Fricko; Peter Kolp; Clara Orthofer; Michael Pimmer; Nikolay Kushin; Adriano Vinca; Alessio Mastrucci; Keywan Riahi; Volker Krey (Environ. Model. Softw., 2019)