@article{MAN_1974__210_162626,
     author = {John J. O'Sullivan},
     title = {Manifolds without {Conjugate} {Points.}},
     journal = {Mathematische Annalen},
     pages = {295--312},
     publisher = {mathdoc},
     volume = {210},
     year = {1974},
     url = {http://geodesic.mathdoc.fr/item/MAN_1974__210_162626/}
}