Maria Chudnovsky William H. Cunningham Jim Geelen An algorithm for packing non-zero <i>A</i> -paths in group-labelled graphs. 145-161 2008 28 Combinatorica 2 http://dx.doi.org/10.1007/s00493-008-2157-8 db/journals/combinatorica/combinatorica28.html#ChudnovskyCG08