Polarized Positrons as Spin Detectors for Paramagnetic Centres in Solids Ch. Deckers, J. Ehmann, H. Greif, F. Keuser, W. Knichel, U. Lauff, K. Maier, A. Siegle et M. Tongbhoyai J. Phys. IV France, 05 C1 (1995) C1-81-C1-86 DOI: 10.1051/jp4:1995109