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@article{IM_1967__3_141877, author = {S. CARTER and S.A. ROBERTSON}, title = {Relations {Between} a {Manifold} and its {Focal} {Set.}}, journal = {Inventiones mathematicae}, pages = {300--307}, publisher = {mathdoc}, volume = {3}, year = {1967}, zbl = {0156.42301}, url = {http://geodesic.mathdoc.fr/item/IM_1967__3_141877/} }
S. CARTER; S.A. ROBERTSON. Relations Between a Manifold and its Focal Set.. Inventiones mathematicae, Tome 3 (1967), pp. 300-307. http://geodesic.mathdoc.fr/item/IM_1967__3_141877/