@article{VMUMM_1982_6_a1,
     author = {I. Kh. Sabitov},
     title = {Smoothness of a hypersurface of positive extrinsic curvature and its fundamental forms in conjugate-harmonic coordinates},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {5--8},
     year = {1982},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1982_6_a1/}
}