@article{RSMUP_2003__109__235_0,
     author = {Fuchs, Laszlo and Shelah, Saharon},
     title = {On a non-vanishing {Ext}},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {235--239},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {109},
     year = {2003},
     mrnumber = {1997989},
     zbl = {1073.13005},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_2003__109__235_0/}
}