@article{DAN_1991_317_5_a15,
     author = {A. A. Vainshtein and V. N. Girs},
     title = {Constitutive isotropic tensor of rank eight},
     journal = {Doklady Akademii Nauk},
     pages = {1094--1098},
     publisher = {mathdoc},
     volume = {317},
     number = {5},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_317_5_a15/}
}