@article{CMH_1963__38_139277,
     author = {B. Eckmann and P.J. Hilton},
     title = {Unions and intersectons in {Homotopy} {Theory.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {293--307},
     publisher = {mathdoc},
     volume = {38},
     year = {1963},
     zbl = {0126.38903},
     url = {http://geodesic.mathdoc.fr/item/CMH_1963__38_139277/}
}