@article{TAM_1990_16_1_a9,
     author = {Dragi Radojevi\'c},
     title = {On a conformally flat space-time},
     journal = {Theoretical and applied mechanics},
     pages = {79 },
     year = {1990},
     volume = {16},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAM_1990_16_1_a9/}
}