@article{SEMR_2007_4_a7,
     author = {V. A. Klyachin and N. M. Medvedeva},
     title = {On the stability of extremal surfaces for a~certain area type functional},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {113--132},
     publisher = {mathdoc},
     volume = {4},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2007_4_a7/}
}