@article{JRAM_1997__487_153921,
     author = {Karsten Grove and Frederick Wilhelm},
     title = {Metric constraints on exotic spheres via {Alexandrov} geometry.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {201--217},
     publisher = {mathdoc},
     volume = {487},
     year = {1997},
     zbl = {0882.53030},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1997__487_153921/}
}