TY - JOUR AU - L. You AU - John Cooper BT - Physical Review A DA - Jan-05-1995 DO - 10.1103/PhysRevA.51.4194 PY - 1995 SP - 4194 EP - 4202 T2 - Physical Review A TI - Semiclassical study of spectral evolution under propagation in an active medium VL - 51 SN - 1050-2947 ER -