@article{QUE_1996_1996_1_a24,
     author = {Fern\'andez Garc{\'\i}a, Francisco R. and Mayor Gallego, Jos\'e A.},
     title = {Dise\~nos muestrales \ensuremath{\pi}-equivalentes y equivalentes de primer orden.},
     journal = {Q\"uestii\'o},
     pages = {45-70},
     publisher = {mathdoc},
     volume = {20},
     number = {1},
     year = {1996},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/QUE_1996_1996_1_a24/}
}