Abstract
Abstract This paper shows that several integrable lattices can be transformed into coupled bilinear differential-difference equations by introducing auxiliary variables. By testing the Backlund transformations for this type of coupled bilinear equations, a new integrable lattice is found. By using the Backlund transformation, soliton solutions are obtained. By the dependent variable transformation, this new coupled bilinear equations can be reduced to a coupled extended Lotka–Voltera equation and another equation.
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