@article{PDA_1983_12_1_a0,
     author = {D. Djurovi\'c},
     title = {Preliminary {Investigation} of {Belgrade} {Longitude} {Variations}},
     journal = {Publications of the Department of Astronomy},
     pages = {5 - 9},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {1983},
     url = {http://geodesic.mathdoc.fr/item/PDA_1983_12_1_a0/}
}