@article{CMH_1986__61_140046,
     author = {Viktor Schroeder and Ch.B. Croke},
     title = {The fundamental group of compact manifolds without conjugate points.},
     journal = {Commentarii mathematici Helvetici},
     pages = {161--176},
     publisher = {mathdoc},
     volume = {61},
     year = {1986},
     zbl = {0608.53038},
     url = {http://geodesic.mathdoc.fr/item/CMH_1986__61_140046/}
}