@article{MS2_1960__8_165740,
     author = {Th. Skolem},
     title = {A {Set} {Theory} {Based} on a {Certain} {3-Valued} {Logic.}},
     journal = {Mathematica Scandinavica},
     pages = {127--136},
     publisher = {mathdoc},
     volume = {8},
     year = {1960},
     zbl = {0096.24301},
     url = {http://geodesic.mathdoc.fr/item/MS2_1960__8_165740/}
}