@article{MAN_1960__140_160771,
     author = {L. H\"ORMANDER},
     title = {Differential {Equations} without {Solutions.}},
     journal = {Mathematische Annalen},
     pages = {169--173},
     publisher = {mathdoc},
     volume = {140},
     year = {1960},
     zbl = {0093.28903},
     url = {http://geodesic.mathdoc.fr/item/MAN_1960__140_160771/}
}