@article{AM2_1986__31_137138,
     author = {Edward W. Packel},
     title = {Linear problems (with extended range) have linear optimal algorithms.},
     journal = {Aequationes mathematicae},
     pages = {18--25},
     publisher = {mathdoc},
     volume = {31},
     year = {1986},
     zbl = {0637.41024},
     url = {http://geodesic.mathdoc.fr/item/AM2_1986__31_137138/}
}