On Coherent Optical Pulse Propagation in One-Dimensional Bragg Grating
  The propagation of the solitary waves in the Bragg grating formed by array of thin dielectric films is considered. We assume that the thin films of contain the resonant molecules, which are evolved according to two-level atoms model, which is used to description of the coherent optical pulses propagation. There the alternative derivation of the Mantsyzov's equations is represented. 
Andrei I. Maimistov