@article{SEMR_2010_7_a14,
     author = {D. A. Berdinskii},
     title = {On some generalization of the {Willmore} functional for surfaces in~$\widetilde{SL}_2$},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {140--149},
     publisher = {mathdoc},
     volume = {7},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2010_7_a14/}
}