J. S. Moodera, Lisa R. Kinder, Terrilyn M. Wong, R. Meservey: Large Magnetoresistance at Room Temperature in Ferromagnetic Thin Film Tunnel Junctions. In: Physical Review Letters. Band74, Nr.16, 17. März 1995, S.3273–3276, doi:10.1103/PhysRevLett.74.3273.