@article{10_2140_agt_2015_15_3253,
     author = {Chen, Weimin},
     title = {Fixed-point free circle actions on 4{\textendash}manifolds},
     journal = {Algebraic and Geometric Topology},
     pages = {3253--3303},
     year = {2015},
     volume = {15},
     number = {6},
     doi = {10.2140/agt.2015.15.3253},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2015.15.3253/}
}