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@article{MZM_1984_35_6_a6, author = {Yu. E. Anikonov}, title = {A criterion for two-dimensional {Riemann} spaces of zero curvature}, journal = {Matemati\v{c}eskie zametki}, pages = {841--845}, publisher = {mathdoc}, volume = {35}, number = {6}, year = {1984}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1984_35_6_a6/} }
Yu. E. Anikonov. A criterion for two-dimensional Riemann spaces of zero curvature. Matematičeskie zametki, Tome 35 (1984) no. 6, pp. 841-845. http://geodesic.mathdoc.fr/item/MZM_1984_35_6_a6/