@article{CMH_1993__68_2_140292,
     author = {Steven Boyer},
     title = {Realization of simply-connected 4-manifolds with a given boundary.},
     journal = {Commentarii mathematici Helvetici},
     pages = {20--47},
     publisher = {mathdoc},
     volume = {68},
     number = {2},
     year = {1993},
     zbl = {0790.57009},
     url = {http://geodesic.mathdoc.fr/item/CMH_1993__68_2_140292/}
}