@article{FPM_2004_10_1_a2,
     author = {R. Vitolo and G. Saccomandi},
     title = {Null {Lagrangians} for nematic elastomers},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {17--28},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2004_10_1_a2/}
}