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Point interactions for the n-th derivative operator in one dimension are investigated. Every such perturbed operator coincides with a selfadjoint extension of the n-th derivative operator restricted ...
Stefan Diehl, A Conservation Law with Point Source and Discontinuous Flux Function Modelling Continuous Sedimentation, SIAM Journal on Applied Mathematics, Vol. 56, No. 2 (Apr., 1996), pp. 388-419 ...