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@articleHammer_2014, title=Oblique incidence of semi-guided waves on rectangular slab waveguide discontinuities: A vectorial QUEP solver, volume=338, DOI=10.1016/j.optcom.2014.09.087, journal=Optics Communications, publisher=Elsevier BV, author=Hammer, Manfred, year=2014, pages=447–456