@article{10_4064_fm_109_3_169_173,
     author = {W. Marek and Pawe{\l} Zbierski},
     title = {On the number of models of the {Kelley-Morse} theory of classes},
     journal = {Fundamenta Mathematicae},
     pages = {169--173},
     publisher = {mathdoc},
     volume = {109},
     number = {3},
     year = {1980},
     doi = {10.4064/fm-109-3-169-173},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-109-3-169-173/}
}