@article{10_4064_fm_61_1_111_119,
     author = {Peter Hilton},
     title = {On systems of interlocking exact sequences},
     journal = {Fundamenta Mathematicae},
     pages = {111--119},
     publisher = {mathdoc},
     volume = {61},
     number = {1},
     year = {1967},
     doi = {10.4064/fm-61-1-111-119},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-61-1-111-119/}
}