@article{RSMUP_1987__77__305_0,
     author = {Brunner, Norbert},
     title = {Spaces of urelements, {II}},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {305--315},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {77},
     year = {1987},
     mrnumber = {904626},
     zbl = {0668.54014},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1987__77__305_0/}
}