@article{AIF_2008__58_3_777_0,
     author = {Rudyak, Yuli B. and Sabourau, St\'ephane},
     title = {Systolic invariants of groups and $2$-complexes via {Grushko} decomposition},
     journal = {Annales de l'Institut Fourier},
     pages = {777--800},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {58},
     number = {3},
     year = {2008},
     doi = {10.5802/aif.2369},
     zbl = {1142.53035},
     mrnumber = {2427510},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/aif.2369/}
}