@article{MAN_1970__186_161980,
     author = {U. NERI},
     title = {The {Integrable} {Kernels} of {Certain} {Pseudo-Differential} {Operators.}},
     journal = {Mathematische Annalen},
     pages = {155--162},
     publisher = {mathdoc},
     volume = {186},
     year = {1970},
     zbl = {0184.17902},
     url = {http://geodesic.mathdoc.fr/item/MAN_1970__186_161980/}
}