@article{SM_2012_203_5_a2,
     author = {A. O. Ivanov and A. A. Tuzhilin},
     title = {One-dimensional {Gromov} minimal filling problem},
     journal = {Sbornik. Mathematics},
     pages = {677--726},
     publisher = {mathdoc},
     volume = {203},
     number = {5},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2012_203_5_a2/}
}