@article{10_4153_CJM_2011_045_8,
     author = {Easton, Robert W.},
     title = {S3-covers of {Schemes}},
     journal = {Canadian journal of mathematics},
     pages = {1058--1082},
     year = {2011},
     volume = {63},
     number = {5},
     doi = {10.4153/CJM-2011-045-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2011-045-8/}
}