Nuclear polarization through optical pumping of gaseous 3He below 1 K M. Himbert, V. Lefevre-Seguin, P.J. Nacher, J. Dupont-Roc, M. Leduc et F. Laloë J. Physique Lett., 44 13 (1983) 523-529 DOI: 10.1051/jphyslet:019830044013052300