@article{10_1017_S0017089515000129,
     author = {BRANDENBURSKY, MICHAEL and GAL, \'SWIATOS{\L}AW R. and K\k{E}DRA, JAREK and MARCINKOWSKI, MICHA{\L}},
     title = {THE {CANCELLATION} {NORM} {AND} {THE} {GEOMETRY} {OF} {BI-INVARIANT} {WORD} {METRICS}},
     journal = {Glasgow mathematical journal},
     pages = {153--176},
     year = {2016},
     volume = {58},
     number = {1},
     doi = {10.1017/S0017089515000129},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089515000129/}
}