@article{AFM_2003_28_1_a13,
     author = {Zair Ibragimov},
     title = {M\"obius modulus of ring domains in {Rn} },
     journal = {Annales Fennici Mathematici},
     pages = {193--206},
     publisher = {mathdoc},
     volume = {28},
     number = {1},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AFM_2003_28_1_a13/}
}