@article{10_4064_fm_139_3_177_191,
     author = {Marcin Penconek},
     title = {On nonparadoxical sets},
     journal = {Fundamenta Mathematicae},
     pages = {177--191},
     publisher = {mathdoc},
     volume = {139},
     number = {3},
     year = {1991},
     doi = {10.4064/fm-139-3-177-191},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-139-3-177-191/}
}