@article{MZ_1996__223_3_174928,
     author = {Frieda M. Ganter},
     title = {Properties of -p . p for {Gorenstein} surface singularities.},
     journal = {Mathematische Zeitschrift},
     pages = {411--420},
     year = {1996},
     volume = {223},
     number = {3},
     zbl = {0901.14006},
     url = {http://geodesic.mathdoc.fr/item/MZ_1996__223_3_174928/}
}