@article{MAN_1982__259_163643,
     author = {C.T.C. Wall},
     title = {A {Splitting} {Theorem} for {Maps} {Into} {IR2} .},
     journal = {Mathematische Annalen},
     pages = {443--454},
     year = {1982},
     volume = {259},
     url = {http://geodesic.mathdoc.fr/item/MAN_1982__259_163643/}
}