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On a ratio theorem for a class of nonlinear boundary value problems
1987
Quarterly of Applied Mathematics
A generalization of Ussing's flux ratio theorem is established as a consequence of a symmetry property of a Green's function. Backlund transformations are then used to construct ratio theorems for certain nonlinear boundary value problems.
doi:10.1090/qam/872816
fatcat:m4aihwazrzdxhgi4anbkqza3tu