%0 Journal Article %J Physical Review Letters %D 2014 %T Long-lived Heteronuclear Spin-Singlet States in Liquids at a Zero Magnetic Field %A Emondts, M. %A Ledbetter, M. P. %A Pustelny, S. %A Theis, T. %A Patton, B. %A Blanchard, J. W. %A Butler, M. C. %A Budker, D. %A Pines, A. %B Physical Review Letters %V 112 %P 077601 %G eng %N 7 %& 077601