@article{10_2140_agt_2018_18_569,
     author = {Dror Farjoun, Emmanuel and Mikhailov, Roman},
     title = {On the third homotopy group of {Orr{\textquoteright}s} space},
     journal = {Algebraic and Geometric Topology},
     pages = {569--582},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {2018},
     doi = {10.2140/agt.2018.18.569},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2018.18.569/}
}