@article{CLTM_1963_1963_1_a8,
     author = {Salinas-R., Baltasar},
     title = {Una clase de grupoides: {Tribus.} {Inmersi\'on} en una tribu.},
     journal = {Collectanea mathematica},
     publisher = {mathdoc},
     number = {1-2},
     year = {1963},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/CLTM_1963_1963_1_a8/}
}