@article{ETNA_2013__40__a2,
     author = {Hakula,  Harri and Rasila,  Antti and Vuorinen,  Matti},
     title = {Computation of exterior moduli of quadrilaterals},
     journal = {Electronic transactions on numerical analysis},
     pages = {436--451},
     year = {2013},
     volume = {40},
     zbl = {1305.65110},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_2013__40__a2/}
}