@misc{ArnoldEhrhardtSofronov2004, author = {Anton Arnold and Matthias Ehrhardt and Ivan Sofronov}, title = {Approximation and fast calculation of non-local boundary conditions for the time-dependent Schr{\"o}dinger equation}, institution = {Technische Universit{\"a}t Berlin}, type = {preprintmatheon}, year = {2004}, }