@article{TEIO_1985_1985_1_a19,
     author = {Fortet, Robert M.},
     title = {Operadores integrales cuyo n\'ucleo es una covarianza.},
     journal = {Trabajos de estad{\'\i}stica y de investigaci\'on operativa},
     pages = {133-144},
     publisher = {mathdoc},
     volume = {36},
     number = {3},
     year = {1985},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/TEIO_1985_1985_1_a19/}
}