@article{10_1090_S0894_0347_1994_1254134_8,
     author = {Caporaso, Lucia},
     title = {A compactification of the universal {Picard} variety over the moduli space of stable curves},
     journal = {Journal of the American Mathematical Society},
     pages = {589--660},
     publisher = {mathdoc},
     volume = {07},
     number = {3},
     year = {1994},
     doi = {10.1090/S0894-0347-1994-1254134-8},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1994-1254134-8/}
}