@article{10_4064_fm193_2_3,
     author = {Saharon Shelah and Lutz Str\"ungmann},
     title = {A characterization of $\mathop{\rm Ext}(G,\mathbb Z)$
 assuming $(V=L)$},
     journal = {Fundamenta Mathematicae},
     pages = {141--151},
     publisher = {mathdoc},
     volume = {193},
     number = {2},
     year = {2007},
     doi = {10.4064/fm193-2-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm193-2-3/}
}