@article{JEMS_2011_13_4_a1,
     author = {Mustafa Kalafat},
     title = {Scalar curvature and connected sums of self-dual 4-manifolds},
     journal = {Journal of the European Mathematical Society},
     pages = {883--898},
     publisher = {mathdoc},
     volume = {13},
     number = {4},
     year = {2011},
     doi = {10.4171/jems/269},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/269/}
}