@article{10_4064_fm_76_2_139_147,
     author = {Leszek Pacholski and Jan Waszkiewicz},
     title = {On compact classes of models},
     journal = {Fundamenta Mathematicae},
     pages = {139--147},
     publisher = {mathdoc},
     volume = {76},
     number = {2},
     year = {1972},
     doi = {10.4064/fm-76-2-139-147},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-76-2-139-147/}
}