@article{MZM_2000_68_4_a9,
     author = {V. T. Fomenko},
     title = {Two-dimensional surfaces with flat normal connections in spaces of constant curvature carrying geodesics of constant curvature},
     journal = {Matemati\v{c}eskie zametki},
     pages = {579--586},
     publisher = {mathdoc},
     volume = {68},
     number = {4},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2000_68_4_a9/}
}