@article{ALCO_2021__4_1_69_0,
     author = {Lutz, Bob},
     title = {Higher discrete homotopy groups of graphs},
     journal = {Algebraic Combinatorics},
     pages = {69--88},
     publisher = {MathOA foundation},
     volume = {4},
     number = {1},
     year = {2021},
     doi = {10.5802/alco.151},
     language = {en},
     url = {https://alco.centre-mersenne.org/articles/10.5802/alco.151/}
}