http://ammin.geoscienceworld.org/cgi/content/abstract/87/10/1333 Electron paramagnetic resonance spectroscopic study of synthetic fluorapatite: Part III. Structural characterization of sub-ppm-level Gd and Mn in minerals at W-band frequency Yuanming Pan1,*, Ning Che http://ammin.geoscienceworld.org/cgi/content/abstract/87/1/37 Electron paramagnetic resonance spectroscopic study of synthetic fluorapatite: Part I. Local structural environment and substitution mechanism of Gd3+ at the Ca2 site Ning Chen1, Yuanming Pan1