@article{PIM_1985_N_S_38_52_a2,
     author = {Aleksandar Ignjatovi\'c},
     title = {An {Ordering} of the set of {Sentences} of {Peano} {Arithmetic}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {13 },
     publisher = {mathdoc},
     volume = {_N_S_38},
     number = {52},
     year = {1985},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1985_N_S_38_52_a2/}
}