@article{10_4064_fm_50_2_207_221,
     author = {B. Eckman and Peter Hilton},
     title = {Structure maps in group theory},
     journal = {Fundamenta Mathematicae},
     pages = {207--221},
     publisher = {mathdoc},
     volume = {50},
     number = {2},
     year = {1961},
     doi = {10.4064/fm-50-2-207-221},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-50-2-207-221/}
}