@article{TAM_1982_8_1_a13,
     author = {Dragi Radojevi\'c},
     title = {Expansion tensor in a modified de {Sitter} metric},
     journal = {Theoretical and applied mechanics},
     pages = {119 },
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {1982},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAM_1982_8_1_a13/}
}