@article{GT_2005_9_4_a1,
     author = {Diao, Guo-An and Feighn, Mark},
     title = {The {Grushko} decomposition of a finite graph of finite rank free groups: an algorithm},
     journal = {Geometry & topology},
     pages = {1835--1880},
     publisher = {mathdoc},
     volume = {9},
     number = {4},
     year = {2005},
     doi = {10.2140/gt.2005.9.1835},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2005.9.1835/}
}