@article{DAN_1980_255_1_a3, author = {V. R. Kireitov}, title = {On some properties of photometric quantities on a {Riemannian} manifold}, journal = {Doklady Akademii Nauk}, pages = {21--26}, publisher = {mathdoc}, volume = {255}, number = {1}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1980_255_1_a3/} }