@article{PDA_1983_12_1_a2,
     author = {I. Lukav\v{c}evi\'c},
     title = {The {World} {Lines} of {Isotropic} {Expansion} in the {De} {Sitter} {Universe}},
     journal = {Publications of the Department of Astronomy},
     pages = {19 - 25},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {1983},
     url = {http://geodesic.mathdoc.fr/item/PDA_1983_12_1_a2/}
}