@article{CSIS_2014_11_2_a23,
     author = {Antonio Terce\~no and M. Gl\`oria Barber\`a-Marin\'e and Hern\'an Vigier and Yanina Laumann},
     title = {Stability of {Beta} {Coefficients} of {Sector} and {Subsector} {Portfolios} in an {Uncertain} {Environment}},
     journal = {Computer Science and Information Systems},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {2014},
     url = {http://geodesic.mathdoc.fr/item/CSIS_2014_11_2_a23/}
}