TY - JOUR AU - A. Koller AU - Michael Beverland AU - Alexey Gorshkov AU - Ana Maria Rey BT - Physical Review Letters DA - 2014-03 DO - 10.1103/PhysRevLett.112.123001 PY - 2014 EP - 123001 T2 - Physical Review Letters TI - Beyond the Spin Model Approximation for Ramsey Spectroscopy UR - http://link.aps.org/doi/10.1103/PhysRevLett.112.123001 VL - 112 SN - 0031-9007 ER -