@article{PIM_1990_N_S_47_61_a9,
     author = {Zoran Kadelburg and Stojan Radenovi\'c},
     title = {On {Ultrapowers} of {Linear} {Topological} {Spaces} without {Convexity} {Conditions}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {71 },
     publisher = {mathdoc},
     volume = {_N_S_47},
     number = {61},
     year = {1990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1990_N_S_47_61_a9/}
}