@article{MZ_1968__106_171025,
     author = {Rolf Leis},
     title = {Zur {Theorie} elektromagnetischer {Schwingungen} in anisotropen inhomogenen {Medien.}},
     journal = {Mathematische Zeitschrift},
     pages = {213--224},
     publisher = {mathdoc},
     volume = {106},
     year = {1968},
     url = {http://geodesic.mathdoc.fr/item/MZ_1968__106_171025/}
}