Fritz Gesztesy 
(m)KdV Solitons on the Background of Quasi-Periodic Finite-Gap Solutions 

Using commutation methods, the authors present a general formalism to construct Korteweg-de Vries (Kd V) and modified Korteweg-de Vries (m Kd V) $N$-soliton solutions relative to arbitrary (m)Kd V background solutions. As an illustration of these techniques,