J Magn Reson. 2011 Dec;213(2):404-9 doi: 10.1016/j.jmr.2011.09.010.

Dynamic nuclear polarization at 9T using a novel 250 GHz gyrotron microwave source. 2003

Bajaj VS, Farrar CT, Hornstein MK, Mastovsky I, Vieregg J, Bryant J, Eléna B, Kreischer KE, Temkin RJ, Griffin RG.

PMID: 22152358
PubMed Entry