BÄCKLUND TRANSFORMATIONS FOR THE EQUATION ∂<sup>2</sup>u/∂x<sup>1</sup>∂x<sup>1</sup>+∂<sup>2</sup>u/∂x<sup>2</sup>∂x<sup>2</sup>-f(u)

BÄCKLUND TRANSFORMATIONS FOR THE EQUATION ∂²u/∂x¹∂x¹+∂²u/∂x²∂x²-f(u)

Li Yan guang

Applied Mathematics and Mechanics (English Edition) . 1989, (2): 139 -143 .

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