@article{VMUMM_2014_5_a10,
     author = {E. G. Puninskiy},
     title = {Natural operators on tensor fields},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {58--62},
     year = {2014},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2014_5_a10/}
}