@article{CLTM_1994_1994_1_a18,
     author = {Haukkanen, P. and Sivaramakrishnan, R.},
     title = {Diversas sumas trigonom\'etricas en varias variables.},
     journal = {Collectanea mathematica},
     pages = {245-261},
     publisher = {mathdoc},
     volume = {45},
     number = {3},
     year = {1994},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CLTM_1994_1994_1_a18/}
}