@article{AIF_2004__54_7_2455_0,
     author = {Turaev, Vladimir},
     title = {Virtual strings},
     journal = {Annales de l'Institut Fourier},
     pages = {2455--2525},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {54},
     number = {7},
     year = {2004},
     doi = {10.5802/aif.2086},
     mrnumber = {2139700},
     zbl = {1066.57022},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/aif.2086/}
}