@article{MM2_1979__29_154655,
     author = {Winfried Kaballo and Albert Schneider},
     title = {On the {Spectral} {Kernel} of {Symmetric} {Extensions.}},
     journal = {Manuscripta mathematica},
     pages = {113--118},
     publisher = {mathdoc},
     volume = {29},
     year = {1979},
     zbl = {0422.47011},
     url = {http://geodesic.mathdoc.fr/item/MM2_1979__29_154655/}
}