@article{MAN_1995__303_4_165372,
     author = {D. Kotschick and P. Lisca},
     title = {Instanton invariants of {...P2} via topology.},
     journal = {Mathematische Annalen},
     pages = {345--372},
     publisher = {mathdoc},
     volume = {303},
     number = {4},
     year = {1995},
     zbl = {0844.57034},
     url = {http://geodesic.mathdoc.fr/item/MAN_1995__303_4_165372/}
}