Coupled scalar fields in a flat FRW universe : renormalisation Baacke, Jürgen Covi, Laura Kevlishvili, Nina 2010 - DESY EPflicht - frei zugänglich
Initial time singularities and admissible initial states for a system of coupled scalar fields Baacke, Jürgen 2009 - DESY EPflicht - frei zugänglich