H. Yue et al., EXACT SOLITON-SOLUTIONS FOR DNLS EQUATION BY THE METHOD OF RIEMANN PROBLEM WITH ZEROS, Communications in Theoretical Physics, 29(4), 1998, pp. 553-558
With the procedure to solve explicitly the equations of the Riemann ma
trix with poles, multisoliton solutions to the DNLS equation are found
formally. A single soliton solution is given explicitly and the asymp
totic behaviors of multisoliton solutions are discussed.