@article{ELMA_1976__31_141177,
     author = {Erwin Kreyszig},
     title = {QR in two dimensions.},
     journal = {Elemente der Mathematik},
     pages = {109--114},
     publisher = {mathdoc},
     volume = {31},
     year = {1976},
     zbl = {0361.65028},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1976__31_141177/}
}