@article{MAN_1977__226_162957,
     author = {Gunter Bengel},
     title = {Wave {Front} {Sets} and {Singular} {Supports} of {Convolutions.}},
     journal = {Mathematische Annalen},
     pages = {247--252},
     publisher = {mathdoc},
     volume = {226},
     year = {1977},
     zbl = {0344.46089},
     url = {http://geodesic.mathdoc.fr/item/MAN_1977__226_162957/}
}