TY - JOUR T1 - Many-Body Treatment of the Collisional Frequency Shift in Fermionic Atoms JF - Phys. Rev. Lett. Y1 - 2009 A1 - Rey, A M A1 - Alexey V. Gorshkov A1 - Rubbo, C VL - 103 U4 - 260402 UR - http://link.aps.org/abstract/PRL/v103/e260402/ ER -