@article{JRAM_1972__255_151237,
     author = {Ya-Yen Lee Wang},
     title = {On the solution of the variational problem of the arc length in 4-dimensinal affine space.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {99--103},
     publisher = {mathdoc},
     volume = {255},
     year = {1972},
     zbl = {0237.53005},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1972__255_151237/}
}