'A' cited 'B'.

'A'
Propagation of ultrashort pulses in a nonlinear long-period fiber grating
Author(s): Liu M (Liu, M.)1, Chiang KS (Chiang, K. S.)2  
Source: APPLIED PHYSICS B-LASERS AND OPTICS    Volume: 94    Issue: 4    Pages: 599-607    Published: MAR 2009    
Addresses:
1. Chongqing Univ, Coll Commun Engn, Chongqing 630044, Peoples R China
2. City Univ Hong Kong, Dept Elect Engn, Kowloon, Hong Kong Peoples R China

'B'
Nonlinear property analysis of long-period fiber gratings using discretized coupled-mode theory
Author(s): Jeong Y, Lee B  
Source: IEEE JOURNAL OF QUANTUM ELECTRONICS    Volume: 35    Issue: 9    Pages: 1284-1292    Published: SEP 1999