@article{CLTM_1978_1978_1_a1,
     author = {Olivert Pellicer, Joaqu{\'\i}n},
     title = {Conservaci\'on de masa material en el proceso de expansi\'on del universo.},
     journal = {Collectanea mathematica},
     pages = {7-10},
     publisher = {mathdoc},
     volume = {29},
     number = {1},
     year = {1978},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CLTM_1978_1978_1_a1/}
}