@article{MV_1968_20_3_a19,
     author = {J. D. Ke\v{c}ki\'c},
     title = {An axiomatization of the propositional calculus and the completeness theorem},
     journal = {Matemati\v{c}ki vesnik},
     pages = {361 },
     publisher = {mathdoc},
     volume = {20},
     number = {3},
     year = {1968},
     url = {http://geodesic.mathdoc.fr/item/MV_1968_20_3_a19/}
}