Navigating Across Non-Navigable Ecore References via OCL. - Martin Hanysz; Tobias Hoppe; Axel Uhl; Andreas Seibel; Holger Giese; Philipp Berger 001; Stephan Hildebrandt (Electron. Commun. Eur. Assoc. Softw. Sci. Technol., 2010)