@article{JRAM_1991__417_153324,
     author = {M. Andreatta and E. Ballico},
     title = {On the adjunction process over a surface in char. p {II:} the singular case.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {77--86},
     publisher = {mathdoc},
     volume = {417},
     year = {1991},
     zbl = {0721.14027},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1991__417_153324/}
}