@article{PIM2_1984__35(49)_117903,
     author = {Bo\v{z}i\'c, Milan},
     title = {Positive logic with double negation.},
     journal = {Publications de l 'Institut Math\'ematique. Nouvelle S\'erie},
     pages = {21},
     publisher = {mathdoc},
     volume = {35(49)},
     year = {1984},
     zbl = {0569.03010},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/PIM2_1984__35(49)_117903/}
}