@article{10_4064_fm_42_2_259_270,
     author = {Andrzej Mostowski},
     title = {Examples of sets definable by means of two and three quantifiers},
     journal = {Fundamenta Mathematicae},
     pages = {259--270},
     publisher = {mathdoc},
     volume = {42},
     number = {2},
     year = {1955},
     doi = {10.4064/fm-42-2-259-270},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-42-2-259-270/}
}