@article{MM2_1984__48_155018,
     author = {Rainer Hempel},
     title = {Periodic {Schr\"odinger} {Operators} with {(Non-Periodic)} {Magnetic} and {Electric} {Potentials.}},
     journal = {Manuscripta mathematica},
     pages = {19--38},
     publisher = {mathdoc},
     volume = {48},
     year = {1984},
     zbl = {0566.35033},
     url = {http://geodesic.mathdoc.fr/item/MM2_1984__48_155018/}
}