@article{TIO_1988_1988_1_a3,
     author = {Llena Sitjes, Jos\'e},
     title = {Dualidad en la programaci\'on lineal en subconjuntos difusos.},
     journal = {Trabajos de investigaci\'on operativa},
     pages = {29-41},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {1988},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/TIO_1988_1988_1_a3/}
}