@article{EXMATH_1989_1989_1_a18,
     author = {Fern\'andez Castillo, Jes\'us M.},
     title = {Algunos anidamientos para phid.},
     journal = {Extracta mathematicae},
     pages = {99-101},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1989_1989_1_a18/}
}