@article{AA_2007_19_1_a2,
     author = {D. Burago and S. Ivanov and D. Shoenthal},
     title = {Two counterexamples in low-dimensional length geometry},
     journal = {Algebra i analiz},
     pages = {46--59},
     publisher = {mathdoc},
     volume = {19},
     number = {1},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AA_2007_19_1_a2/}
}