@article{DOCMA_2019__24__a18,
     author = {Helle, Gard Olav and Rognes, John},
     title = {Boardman's {Whole-Plane} {Obstruction} {Group} for {Cartan-Eilenberg} {Systems}},
     journal = {Documenta mathematica},
     pages = {1855--1878},
     publisher = {mathdoc},
     volume = {24},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DOCMA_2019__24__a18/}
}