@article{JRAM_1965__219_150695,
     author = {LeRoy M. Kelly and David C. Kay},
     title = {Arcs of vanishing metric curvature.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {214--220},
     publisher = {mathdoc},
     volume = {219},
     year = {1965},
     zbl = {0129.14505},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1965__219_150695/}
}