@article{MZ_1981__177_173080,
     author = {Eberhard Siebert and Arnold Jannssen},
     title = {Convolution {Semigroups} and {Generalized} {Telegraph} {Equations.}},
     journal = {Mathematische Zeitschrift},
     pages = {519--532},
     publisher = {mathdoc},
     volume = {177},
     year = {1981},
     zbl = {0443.60010},
     url = {http://geodesic.mathdoc.fr/item/MZ_1981__177_173080/}
}