TY - JOUR AU - Thomas AU - M Hayden AU - P.J. Nacher AU - A Petukhov AU - B Saam AU - T Walker C2 - Physical Review A DA - 2013-07-24 LA - en PB - Physical Review A PY - 2013 TI - Comment on "Enhanced polarization and mechanisms in optically pumped hyperpolarized 3He in the presence of 4He" ER -