@article{MM2_1988__62_3_155351,
     author = {Burkhard Haastert},
     title = {On direct and inverse images of {D-Modules} in prime characteristic.},
     journal = {Manuscripta mathematica},
     pages = {341--354},
     publisher = {mathdoc},
     volume = {62},
     number = {3},
     year = {1988},
     zbl = {0673.14012},
     url = {http://geodesic.mathdoc.fr/item/MM2_1988__62_3_155351/}
}