Neutron scattering : lectures of the JCNS Laboratory Course held at Forschungszentrum Jülich and at the Heinz Maier-Leibnitz Zentrum Garching / Stephan Förster, Karen Friese, Margarita Kruteva, Shibabrata Nandi, Mirijam Zobel, Reiner Zorn (editors) : in cooperation with RWTH Aachen