@article{TM_2012_278_a20,
     author = {Yu. L. Sachkov},
     title = {Closed {Euler} elasticae},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {227--241},
     publisher = {mathdoc},
     volume = {278},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM_2012_278_a20/}
}