SPIE Proceedings [SPIE 4th International Conference on Applications of Nuclear Techniques: Neutrons and their Applications - Crete, Greece (Sunday 12 June 1994)] International Conference on Neutrons and Their Applications - <title>Phase problem and the determination of sample profiles in neutron-specular reflection</title>Lipperheide, R.; Vourvopoulos, George; Paradellis, Themis · 1995