@article{10_4171_dm_717,
     author = {Gard Olav Helle and John Rognes},
     title = {Boardman's {Whole-Plane} {Obstruction} {Group} for {Cartan-Eilenberg} {Systems}},
     journal = {Documenta mathematica},
     pages = {1855--1878},
     year = {2019},
     volume = {24},
     doi = {10.4171/dm/717},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/717/}
}