@article{10_4064_fm_71_2_165_169,
     author = {Zygfryd Kominek},
     title = {On the sum and difference of two sets in topological vector spaces},
     journal = {Fundamenta Mathematicae},
     pages = {165--169},
     publisher = {mathdoc},
     volume = {71},
     number = {2},
     year = {1971},
     doi = {10.4064/fm-71-2-165-169},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-71-2-165-169/}
}