@article{PIM_1984_N_S_35_49_a2,
     author = {Milan Bo\v{z}i\'c},
     title = {Positive {Logic} with {Double} {Negation}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {21 },
     year = {1984},
     volume = {_N_S_35},
     number = {49},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1984_N_S_35_49_a2/}
}