@article{10_4064_fm208_3_3,
     author = {James H. Schmerl},
     title = {Covering the plane with sprays},
     journal = {Fundamenta Mathematicae},
     pages = {263--272},
     publisher = {mathdoc},
     volume = {208},
     number = {3},
     year = {2010},
     doi = {10.4064/fm208-3-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm208-3-3/}
}