@article{IM_1988__94_2_143626,
     author = {Joseph Bernstein and Valery Lunts},
     title = {On non-holonomic irreducible {D-modules.}},
     journal = {Inventiones mathematicae},
     pages = {223--244},
     publisher = {mathdoc},
     volume = {94},
     number = {2},
     year = {1988},
     zbl = {0658.32009},
     url = {http://geodesic.mathdoc.fr/item/IM_1988__94_2_143626/}
}