@article{MAN_1963__149_161031,
     author = {A.B. ANDERSON and N.D. BELNAP JR.},
     title = {First {Degree} {Entailments.}},
     journal = {Mathematische Annalen},
     pages = {302--319},
     publisher = {mathdoc},
     volume = {149},
     year = {1963},
     zbl = {0113.00402},
     url = {http://geodesic.mathdoc.fr/item/MAN_1963__149_161031/}
}