@article{CMH_1979__54_139808,
     author = {Hans-Christoph Im Hof and P.E. Ehrlich},
     title = {Dirichlet regions in manifolds without conjugate points.},
     journal = {Commentarii mathematici Helvetici},
     pages = {642--658},
     publisher = {mathdoc},
     volume = {54},
     year = {1979},
     zbl = {0419.53025},
     url = {http://geodesic.mathdoc.fr/item/CMH_1979__54_139808/}
}