@article{RRACEFN_1998_1998_1_a23,
     author = {G\'omez, V{\'\i}ctor and  G\'omez-Villegas, A.},
     title = {Initialiting the kalman filter for nonstationary state space models},
     journal = {Revista de la Real Academia de Ciencias Exactas, F{\'\i}sicas y Naturales },
     pages = {377-385},
     publisher = {mathdoc},
     volume = {92},
     number = {4},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RRACEFN_1998_1998_1_a23/}
}