@article{JRAM_1997__489_153930,
     author = {Wojciech Wieczorek},
     title = {The {Donaldson} invariant and embedded 2-spheres.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {15--52},
     year = {1997},
     volume = {489},
     zbl = {0890.57030},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1997__489_153930/}
}