Thurber, Kent R Increasing 14N NQR signal by 1H-14N level crossing with small magnetic fields. [electronic resource] - Journal of magnetic resonance (San Diego, Calif. : 1997) Nov 2005 - 118-28 p. digital Publication Type: Journal Article ISSN: 1090-7807 Standard No.: 10.1016/j.jmr.2005.07.016 doi