TY - JOUR AU - John Cooper BT - Reviews of Modern Physics DA - 1967-01 DO - 10.1103/RevModPhys.39.167 PY - 1967 SP - 167 EP - 177 T2 - Reviews of Modern Physics TI - Broadening of Isolated Lines in the Impact Approximation Using a Density Matrix Formulation VL - 39 SN - 0034-6861 ER -