@article{VMUMM_1982_2_a10,
     author = {N. D. Beklemishev},
     title = {Invariants of cubic forms in four variables},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {42--49},
     publisher = {mathdoc},
     number = {2},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1982_2_a10/}
}