From strings to the MSSM Hans Peter Nilles, Saúl Ramos-Sánchez, Michael Ratz and Patrick K. S. Vaudrevange Eur. Phys. J. C, 59 2 (2009) 249-267 Published online: 25 October 2008 DOI: 10.1140/epjc/s10052-008-0740-1